certificazioni MCAD per il fmw 3.0

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  - 1
    - Debugger Step Over Attribute Hi, is there an debugger step over attribute that I can use on properties? For instance, I have a singlton class with an "Instance" property: public MyClass Instance { get { if (m_instance == null) { m_instance = new MyClass(); } return m_instance; } } It's annoying when i have a function like, MyClass.Instance.DoSomething(). I have to use the step into command, but first it steps into the property, then i have to go out of that and step in again to go into the actual function. Thanks, Tag: certificazioni MCAD per il fmw 3.0 Tag: 124549
  - 2
    - How to dialup? I need to activate an Internet dialup connection from a .NET application; how can this be done? Thanks Massimo Tag: certificazioni MCAD per il fmw 3.0 Tag: 124547
  - 3
    - how to get the namespace inside a static method? Hi there, I have a class with a static method, how can I find the namespace of the class from inside the method. TIA Tag: certificazioni MCAD per il fmw 3.0 Tag: 124544
  - 4
    - DataAdapter.Update PB with a new database Hi, With a NEW database, I have an auto-generate DataSet ()with menu "Add new DataSource...") with two DataTables, parentTable and childTable, and a relation between them. I fill these two tables with five records, then try to update database with these records, using the autogenerate parentDataTableTableAdapter and childTableTableAdapter, after having set a ForeignKeyConstraint on childTable, related to the relation. Some problems appear when I update a new created database. First problem : when I use parentDataTableTableAdapter.Update(), an exception is thrown, telling me that a row ID is already present in parentTable. The problem comes from the autoincrementseed of id column that is set to 0, althrough it is set to 1 in the database. So then first row is updated, its id in DataSet is set to 1, already in table. To avoid this feature, I found two solutions : - Set autoincrement seed to 1. But, a new problem can appear if one record is already in database - Set dataSet.EnforceConstraints to false In this last case, I have a new problem appearing : after the parentTable update, the child table foreign key is set to the last updated row of parentTable. This trouble is certainly due to MSDN advice (ForeignKeyConstraint) : "Constraints are not enforced unless the EnforceConstraints property is set to true" But update works fine when the database has already some records ! So, please, how can I do to avoid all these problems ? Thanks in advance, FG Tag: certificazioni MCAD per il fmw 3.0 Tag: 124538
  - 5
    - MyProj.svhost.exe running alone Hi group I am testing the Visual 2005 Express Edition. I have a solution with a few projects (WinForms, and ClassLibrary), the start up projet is MyProject. When i open the solution using visual, MyProject.svhost.exe start imm=E9diately.I cant run my project using debug. i can run using the "run without debug" option. If i try to kill MyProjet.svhost.exe in my windows App manager, it is killed, and immediately recreated (by visual). What is my problem ? I don't know how to work, please help ? ROM Tag: certificazioni MCAD per il fmw 3.0 Tag: 124537
  - 6
    - stupid .net framework 3.0 ? Ok guys i know this is a stupid question but here goes. I decided tonight was going to be the night to learn this new .net framework 3.0. I downloaded the new release of .net framework 3. I also installed windows SDK & the visual studio plugins for WF,WCF, WPF. Ok my first quest was try research this LINQ stuff a little bit bit suprised to see nothing relating to the .Net framework 3.0 in visual studio except a .Net framework 3.0 that had stuff like a template for creating XAML app which im not there yet so i don't want to use. Ok one of the first things i was going to see is if "var" was even there and it wasn't. SO i tried to go add System.Query manually through the .Net references and its not there. What gives? What do i need to do so i can start coding stuff with the .Net framework? Id like to do a working example of an windows forms application using LINQ. Any help would be apprecaited. thanks, ncage Tag: certificazioni MCAD per il fmw 3.0 Tag: 124531
  - 7
    - BHOs, I.E. ToolBars, and such I am having to get involved in writing Browser Helper Objects in Managed Code and to write toolbars and interface the two. Because BHOs have been clasically written in C++ using ATL, most of the discussions are in that arena. Are there any forums or other types of technical exchanges regarding this type of development in .Net? -- Regards, Gary Blakely Dean Blakely & Associates www.deanblakely.com Tag: certificazioni MCAD per il fmw 3.0 Tag: 124529
  - 8
    - dose the attribute know what the class or property is? hi everybody, i am using some attribute for a proerty. could the attribute get some class or property information by itself? i mean, dose the attribute know what the class or property is? and how? thanks! Tag: certificazioni MCAD per il fmw 3.0 Tag: 124525
  - 9
    - using preprocessor directive for cross framework compatibility Hello all, I have some common classes that I routinely use with all the dotnet projects that I work with. I have these classes in a separate file so that it becomes easy for me to include them into projects. Some of these projects are done in visual studio 2003 and some are in visual studio 2005. lately I have started using some of the classes (FTPWebrequest) which are specific to the dotnet framework 2.0 (VS 2005). Now this file cannot be included into the vs2003 projects as they would give compile errors. I did not want to to maintain two different files for these 2 environments. I know that we can use preprocessor directives (#if ) for this but I did not know how to identify the IDE version (VS 2003 or VS 2005) to use in the If directive. Can you help me with this. thanks in advance, Praveen Tag: certificazioni MCAD per il fmw 3.0 Tag: 124518
  - 10
    - Need help changing AxWebBrowser (COM) code to .NET Web Browser! object obj = axWebBrowser1.GetOcx(); IOleObject oc = obj as IOleObject; oc.SetClientSite(this); How can I make this code work with the .NET 2.0 Web Browser Control Tag: certificazioni MCAD per il fmw 3.0 Tag: 124509
  - 11
    - Trace.WriteLine(object value) - causes "System.InvalidOperationException: Collection was modified; enumeration operation may not execute." For some reason I am getting the following exception when calling Trace.WriteLine(object value): "System.InvalidOperationException: Collection was modified; enumeration operation may not execute." if (Trace.Listeners.Count > 0) { Trace.WriteLine(entry); // line 424 } - Here is the stack trace: ********* Exception details: ********** Unexpected exception. ---> System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.Collections.ArrayList.ArrayListEnumeratorSimple.MoveNext() at System.Diagnostics.TraceInternal.WriteLine(Object value) at System.Diagnostics.Trace.WriteLine(Object value) at MyLogger.Write(LogEntry entry) in MyLogger.cs:line 424 - If I where to instead do the following, it would work. So this seems that something in the framework is attempting to modify the Trace.Listeners collection: for (int i = 0; i < Trace.Listeners.Count; i++) { TraceListener traceListener = Trace.Listeners[i]; traceListener.WriteLine(entry); } Tag: certificazioni MCAD per il fmw 3.0 Tag: 124506
  - 12
    - Trace.WriteLine(object value) - causes "System.InvalidOperationException: Collection was modified; enumeration operation may not execute." For some reason I am getting the following exception when calling Trace.WriteLine(object value): "System.InvalidOperationException: Collection was modified; enumeration operation may not execute." if (Trace.Listeners.Count > 0) { Trace.WriteLine(entry); // line 424 } - Here is the stack trace: ********* Exception details: ********** Unexpected exception. ---> System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.Collections.ArrayList.ArrayListEnumeratorSimple.MoveNext() at System.Diagnostics.TraceInternal.WriteLine(Object value) at System.Diagnostics.Trace.WriteLine(Object value) at MyLogger.Write(LogEntry entry) in MyLogger.cs:line 424 - If I where to instead do the following, it would work. So this seems that something in the framework is attempting to modify the Trace.Listeners collection: for (int i = 0; i < Trace.Listeners.Count; i++) { TraceListener traceListener = Trace.Listeners[i]; traceListener.WriteLine(entry); } Tag: certificazioni MCAD per il fmw 3.0 Tag: 124505
  - 13
    - check caller before ServiceBase.Run? I have a service application in C#. If the user double-clicks the service EXE, I want to display a form with options to install or uninstall. In other words, I want: static void Main() { if (invoked by user) { // <-- how to implement this? // display GUI... } else { // invoked by SCM ServiceBase.Run(new ServiceBase[] { new MyServiceClass() }); } } How can I determine how the EXE was invoked? Thanks! Steve Tag: certificazioni MCAD per il fmw 3.0 Tag: 124504
  - 14
    - Printing images from a background component I need to print the images from a background component which is not a part of WinForm or WebFrom application. I can start a Print command within the component and it will work on some printers, sort of.. On many others printers the output is garbled. I guess some printers are capable of using raw tiff/jpg data while others aren't. I was hoping that there is some magic Printer class in Framework that would solve my problem... There is a lot of printer-related classes available for WinForms, but I just have a background component that needs to print.. Is there a hope? Thanks, -Stan Tag: certificazioni MCAD per il fmw 3.0 Tag: 124499
  - 15
    - Raw TCP/IP library? Hi to all :-) I need to know if there is (inside the main .NET framework or available as a library) any TCP/IP implementation which can be run over a serial line. I know the request can sound quite strange, so here are some more elements :-) I'm testing a client/server application which will be composed of mobile embedded clients connected to the Internet through GPRS modems and a central server (written in .NET/C#) which will sit there receiving data from the clients. The actual clients' CPU will be a mcirocontroller, so their firmware will be written in plain C language, but for now the actual hardware isn't available, so I'm just simulating them using standard Windows program and TCP/IP sockets. The GPRS modem is a device which can be accessed through a serial port and, when given proper commands (some proprietary extensions of the AT set), establishes a GPRS connection, which acts just like a standard modem connection to an ISP; after doing this, the controlling program needs to run TCP/IP (PPP) over the "virtual" serial line which is created. Since I'm testing this modem's behaviour from a Windows application, I need to go through the whole process of establishing a connection and handling it; I managed to use Windows to do this by connecting the modem to a computer, installing a "standard modem" on the same serial port and creating a DUN connection which, instead of dialing a phone number, just sends the proper AT commands to establish the GPRS connection; this way, Windows' own TCP/IP stack is used. Everything works fine. Now I need to handle this from an application, so I'm in need of a TCP/IP protocol stack (with PPP!) to run over the GPRS connection, in order to test the whole process; the actual clients will of course have their own TCP/IP stack: the microcontrollers I'll use comes with proper C libraries. I'd like to know if there is anything available for .NET which can run TCP/IP and PPP over a serial line; if there isn't anything available for .NET, a standard C library could also do, because I'm anyway going to have to use one for the final development process, so I can just use it for this intermediate step and write the simulated clients in C. Thanks for any suggestion about this strange issue :-) Massimo Tag: certificazioni MCAD per il fmw 3.0 Tag: 124497
  - 16
    - Error 4786 with Windows Service After my Windows service runs for a few days (sometimes 5, sometimes 3), I'm getting the following exception in the Event Viewer: Event Type: Error Event Source: COM+ Event Category: Unknown Event ID: 4786 Date: 10/31/2006 Time: 1:29:50 AM User: N/A Computer: KII-SERV-SQL Description: The system has called a custom component and that component has failed and generated an exception. This indicates a problem with the custom component. Notify the developer of this component that a failure has occurred and provide them with the information below. Component Prog ID: 1[ODBC][Env 45814e8] Method Name: IDispenserDriver::CreateResource Process Name: DTSService.exe Exception: C0000005 Address: 0x04972018 Call Stack: pvm90sec! + 0x2018 pvm90sec! + 0x2516 I tried looking for more information on the web, but I haven't really found anything that would explain what's possibly causing the exception. Why it would fail only after a certain number of days? Thank you for any help. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124495
  - 17
    - Can I use WCF right now? Is it possible to convert my app which is in Framework 2 to 3 using VS 2005 and release it to customer? What approach must I take? Tag: certificazioni MCAD per il fmw 3.0 Tag: 124487
  - 18
    - How to move from .NET Remoting to WCF What is the best way? Is there a good article? Tag: certificazioni MCAD per il fmw 3.0 Tag: 124486
  - 19
    - Loss message in Socket Async mode Hi, all Did not find a .Net Communication forum to post. I am soing a client/server message system and using C#.net socket and Async mode. Pretty much as described in article http://www.developerfusion.co.uk/show/3997/3/ But I have a big issue with this approach and I am not what did I do wrong. the client send message so quick that when I loss the second message. I need to call endReceive in my Callback function and process the first message, now the second message is arrived and since I have not call beginReceive, then, I loss the second message. Am I doing wrong or is that unavoidable? Thanks in advance -rockdale -------------------------------------------------------------- source code from the article is attached. byte[] m_DataBuffer = new byte [1024]; IAsyncResult m_asynResult; public AsyncCallback pfnCallBack ; public Socket m_socClient; // create the socket... public void OnConnect() { m_socClient = new Socket (AddressFamily.InterNetwork,SocketType.Stream ,ProtocolType.Tcp ); // get the remote IP address... IPAddress ip = IPAddress.Parse ("10.10.120.122"); int iPortNo = 8221; //create the end point IPEndPoint ipEnd = new IPEndPoint (ip.Address,iPortNo); //connect to the remote host... m_socClient.Connect ( ipEnd ); //watch for data ( asynchronously )... WaitForData(); } public void WaitForData() { if ( pfnCallBack == null ) pfnCallBack = new AsyncCallback (OnDataReceived); // now start to listen for any data... m_asynResult = m_socClient.BeginReceive (m_DataBuffer,0,m_DataBuffer.Length,SocketFlags.None,pfnCallBack,null); } public void OnDataReceived(IAsyncResult asyn) { //end receive... int iRx = 0 ; iRx = m_socClient.EndReceive (asyn); char[] chars = new char[iRx + 1]; System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder(); int charLen = d.GetChars(m_DataBuffer, 0, iRx, chars, 0); System.String szData = new System.String(chars); WaitForData(); } Tag: certificazioni MCAD per il fmw 3.0 Tag: 124479
  - 20
    - problems with xmlserializer on domain machine Hello. I have developed an application (an office addin).The application works fine with no error messages on my devoping machine (that machine is not connected to any domains). I have problems getting this application to run on a computer where the user is on a domain (as in a big company where you log on to the company domain). The funny thing is that the application works fine in outlook. But not in word or excel... The error occurs when trying to create the proxy object. This proxy objects creates successfully when run from outlook. The stack trace from my error is as follows: at System.IO._Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access) at System.IO.FileStream.Compiler.TempFileCollection.EnsureTempNameCreated() at System.IO.FileStream.Compiler.TempFileCollection.AddExtension(String fileExtension, Boolean keepFile) at System.IO.FileStream.Compiler.TempFileCollection.AddExtension(String fileExtension) at Microsoft.CSharp.CSharpCodeGenerator.System.CodeDom.Compiler.ICodeCompiler.CompileAssemblyFromSourceBatch(CompilerParameters options, String[] sources) at System.codeDom.Compiler.CodeDomProvider.CompileAssemblyFromSource(CompilerParameters options, String[] sources) at System.Xml.Serialization.TEmpAssembly.GenerateAssembly(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, Evidence evidence, CompilerParameters parameters, Assembly assembly, Hashtable assemblies) at System.Xml.Serialization.TempAssembly..ctor(XmlMapping[] xmlMappings, Type[] types, String defaultNAmespace, String location, Evidence evidence) at System.Xml.Serialization.XmlSerializer.FromMappings(XmlMapping[] mappings, Type type) at System.Web.Services.Protocols.SoapClientType..ctor(Type type) at System.Web.Services.Protocols.SoapHttpClientProtocol..ctor() After reading several posts on the internet I found something about calling the XmlSerializer could create problems. This because it has to compile code and has to make a temporary file to write to. Is there anything is this lead or are ther other things that may cause my problems? I'll be very happy for any hints or tips you can give me :) Tag: certificazioni MCAD per il fmw 3.0 Tag: 124477
  - 21
    - Call "Sub Main" in (WPF) XAML-Application? I have installed Framework 3.0 and Visual Studio 2005 extensions for .NET Framework 3.0 (WCF & WPF), November 2006 CTP. If I make a new WindowsApplication the StartupObject is not set. But the Application starts with Window1.xaml If set the StartupObject to "Sub Main" What more must I do that I can start the Application with the "Sub Main". Or in other words, how can start my Application first with a Custom Methode where I can define the Window-XAML to show? Best regards Horst Tag: certificazioni MCAD per il fmw 3.0 Tag: 124471
  - 22
    - Application terminates due to access violation? Does anyone knows the meaning with KB823140 and KB903886? These articles treat the issue of "Access Voilation" in .NET framework. I have an application developed in C# that sometimes simply dies. No messages, no error codes, no exceptions. A few days ago I got a tip that this might be caused by an "Access Violation" when calling methods in COM components. Daniel Tag: certificazioni MCAD per il fmw 3.0 Tag: 124469
  - 23
    - Socket close notification I am so surprised to find that there is no close notification in socket class. Like OnClose in MFC CAsyncSocket. Any suggestions please ...... Tag: certificazioni MCAD per il fmw 3.0 Tag: 124467
  - 24
    - Socket.BeginReceive with timeout Is there any way that Callback function returns, either it has got some data, or the time out has occured. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124466
  - 25
    - Bug: Localization for Button Control in inherited UserControl Hi everyone, After trying to make this work for a while I didn't get a chance to obtain what i was supposed to, so here is the description of the bug (I think) I found : Steps to reproduce : 1. Create a new Windows Application project. 2. Create a UserControl (ex: UCMenu) and set it to localizable in design time. 3. Put one Label and one Button on it(ex. name: buttonToLook), set on them different Text properties values depending on languages (ex: (default) & fr). 4. Expose Text properties of all 4 controls with localizable attribute on it ([Localizable(true)]). 4. Create a UserControl (ex. name: UCInheritedUCMenu) inheriting from UCMenu, set it to localizable in design time. 5. Put UCInheritedUCMenu on the project main form (and set form also to Localizable). 6. In Program.cs, set Thread.CurrentThread.CurrentUICulture to "fr". 7. Run the application and notice that only buttonToLook does not take its localisable value (you can add other controls on UCInheritedUCMenu or form to see that only buttonToLook is not localized). 8. Comment Text property exposure for buttonToLook and run the application again : text of button is now localized. Thanks for all your help. Hope You'll give a correction for this :-) Tag: certificazioni MCAD per il fmw 3.0 Tag: 124465
- Next
  - 1
    - Spontaneous NullReferenceException in System.Windows.Forms In our .NET Framework 1.1 Application that is installed on about 800 PC's we have 5 PC's that has spontaneous NullReference Exceptions (Windows XP & 2000 uptodate) in System.Windows.Forms. We already removed any Crossthread Calls. Reinstalling and replacing the computer hasn't brought us any better results. In some cases this exception only appears twice a week, sometimes 20 times a day depending on workingday or / and computer. Here are the two different call stacks (sometime it appears also with SetActiveCore: Stack Trace: at System.Windows.Forms.UnsafeNativeMethods.PeekMessage(MSG& msg, HandleRef hwnd, Int32 msgMin, Int32 msgMax, Int32 remove) at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.RunDialog(Form form) at System.Windows.Forms.Form.ShowDialog(IWin32Window owner) at System.Windows.Forms.Form.ShowDialog() Stack Trace: at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd, Int32 nCmdShow) at System.Windows.Forms.Control.SetVisibleCore(Boolean value) at System.Windows.Forms.Form.SetVisibleCore(Boolean value) at System.Windows.Forms.Form.ShowDialog(IWin32Window owner) at System.Windows.Forms.Form.ShowDialog() Tag: certificazioni MCAD per il fmw 3.0 Tag: 124463
  - 2
    - Other printing problem (resolution not honored) Before printing I create an instance of PrintDocument as Follow (beware, pseudo code) //============================== PrinterResolution pr = new PrinterResolution(); pr.X= 600; pr.Y= 600; pr.Kind = PrinterResolutionKind.High; PrinterSettings printer = new PrinterSettings(); printer.PrinterName = "my printer"; printer.PageSettings.PrinterResolution = pr; PrintDocument pd = new MyPrintDocument(); pd.PrinterSettings = ps; //============================== That seems to work, even in OnPrintPage() the printer resolution is the one I requested. On top of that the resolution is one supported by the printer (according to the PrinterSettings class) Yet it doesn't seemed to be honoured! :( Any tip? Tag: certificazioni MCAD per il fmw 3.0 Tag: 124454
  - 3
    - an existing connection was forcibly closed by the remote host Hello, I am developing an HTTP/1.1 proxy server in c#.net. I am encountering the following exception when I try to send the response body back to the client: "An existing connection was forcibly closed by the remote host". This exception is thrown by the Socket.Send() method (where the specific socket in this case is the client socket). Additionally, if I do not send the response headers back to the client, I do not get this error when sending the response body. Any ideas/pointers on this issue? Thanks, Vishal Tag: certificazioni MCAD per il fmw 3.0 Tag: 124450
  - 4
    - Printing Problem Before printing I create an instance of PrintDocument as Follow (beware, pseudo code) //============================== PaperSize ps = new PaperSize(); ps.Kind = PaperKind.A3 ps.Width = 1169; ps.Height = 1654; PrinterSettings printer = new PrinterSettings(); printer.PrinterName = "my printer"; printer.PageSettings.PaperSize = ps; PrintDocument pd = new MyPrintDocument(); pd.PrinterSettings = ps; //============================== As you culd see I set the page's size (I set only value listed in the list of PaperSize of the printer). Now my problem is, whatever I do, it seems do ignore my page settings!!! Am I missing something? Tag: certificazioni MCAD per il fmw 3.0 Tag: 124449
  - 5
    - Handling unknown elements with a ConfigurationElement Hi, Since the IConfigurationSectionHandler interface has been deprecated since the introduction of .NET 2.0, I'm trying to use the new configuration classes to handle a custom configuration section. I've gone through all the samples and MSDN docs, but none of them answer my question. What is specific (I think) is that I want to have a child element that is not known until runtime: <processingService> <processes> <process name="Process1" type="SomeNamespace.Process1, SomeAssembly"> ....elements specific to the Process1 class </process> <process name="Process2" type="SomeNamespace.Process2, SomeAssembly"> ....elements specific to the Process2 class </process> </processes> </processingService> Essentially, I want to allow each <process> element to have some child elements only known by the class that it refers to (e.g. Process1). I've defined the ConfigurationSection, ConfigurationElementCollection, ConfigurationElements and ConfigurationProperties as it should, and everything works fine until I add some arbitrary child elements. The configuration framework then throws an exception resulting from the unrecognized elements. As a workaround, I can prevent that exception by overriding the OnDeserializeUnrecognizedElement method of the ConfigurationElement that represents the <process> element. I can even extract the child XML and store it somewhere. But with that, I want to be able to deserialize that XML to a ConfigurationElement subclass provided by the ProcessX class (because they are the only ones who should know what that XML means). Unfortunately, there is no method or interface I can find to manually serialize some XML to a ConfigurationElement subclass. Question 1: What is the preferred way of dealing with unknown child elements in .NET 2.0? Question 2: How can I programmatically (de)serialize XML to/from a ConfigurationElement subclass which has properties that have [ConfigurationProperty] attributes on them. Dennis Doomen ICT Consultant / Software Architect Ordina SI&D Development Centre Microsoft Ringwade 1 3439 LM Nieuwegein Email: dennis.doomen@ordina.nl Weblog: blog.smart-ms.ordina.nl en www.dennisdoomen.net Tag: certificazioni MCAD per il fmw 3.0 Tag: 124437
  - 6
    - Handling unknown elements with a ConfigurationElement Hi, Since the IConfigurationSectionHandler interface has been deprecated since the introduction of .NET 2.0, I'm trying to use the new configuration classes to handle a custom configuration section. I've gone through all the samples and MSDN docs, but none of them answer my question. What is specific (I think) is that I want to have a child element that is not known until runtime: <processingService> <processes> <process name="Process1" type="SomeNamespace.Process1, SomeAssembly"> ....elements specific to the Process1 class </process> <process name="Process2" type="SomeNamespace.Process2, SomeAssembly"> ....elements specific to the Process2 class </process> </processes> </processingService> Essentially, I want to allow each <process> element to have some child elements only known by the class that it refers to (e.g. Process1). I've defined the ConfigurationSection, ConfigurationElementCollection, ConfigurationElements and ConfigurationProperties as it should, and everything works fine until I add some arbitrary child elements. The configuration framework then throws an exception resulting from the unrecognized elements. As a workaround, I can prevent that exception by overriding the OnDeserializeUnrecognizedElement method of the ConfigurationElement that represents the <process> element. I can even extract the child XML and store it somewhere. But with that, I want to be able to deserialize that XML to a ConfigurationElement subclass provided by the ProcessX class (because they are the only ones who should know what that XML means). Unfortunately, there is no method or interface I can find to manually serialize some XML to a ConfigurationElement subclass. Question 1: What is the preferred way of dealing with unknown child elements in .NET 2.0? Question 2: How can I programmatically (de)serialize XML to/from a ConfigurationElement subclass which has properties that have [ConfigurationProperty] attributes on them. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124436
  - 7
    - How can I use Regasm on server? Hello all. I have an assembly that needs to be registered on a server for use with SQL Server 2k. Locally I can run Regasm from the VS.NET command window and that's that. But how can I get the assembly registered on the (or any) server? I have the dll, snk...all that, but I can't figure out how to register the thing so my procs don't return the "Invalid Class String" error (for lack of a ProgID)? I'm very new to having to use this tool, so I may be just overlooking something pretty basic. Thanks for your help! Bryan Tag: certificazioni MCAD per il fmw 3.0 Tag: 124432
  - 8
    - FileSystemWatcher help! Okay, I am writing a service that monitors the file system on one of our servers and I can take of that in a cinch. However, I found no properties or methods available to see who the user is that controls the process performing the deletion. I also need to know what application is doing the delete. I only want to know when a user is manually delete a file through windows explorer. Any suggestions? Any P/Invoke hooks? Tag: certificazioni MCAD per il fmw 3.0 Tag: 124424
  - 9
    - IO.Compression and Encryption Hi, Environment: VB 2005 Professional Both ends, its the application which is doing the functionalities. At the despatch end, We have a text file which is to be compressed and encrypted and sent over to the recepient. At the recepient end, the file is decrypted and then decompressed. Say the original file is CreateTestPort3.txt CreateTestPort3.txt: 1306 KB (original file) TestGZipped:151 KB (compressing the original file using GZipStream) EncryptText:151 KB (encrypting the compressed file) DecryptText: 76 KB (decrypting the earlier file) CreateTestPort3GOriginal: 0 KB (decompressing the file) We receive an error at this stage: Error : An unhandled exception of type 'System.IO.InvalidDataException' occurred in System.dll Additional information: The magic number in GZip header is not correct. Make sure you are passing in a GZip stream. Can anyone point out what are we doing wrong? If we just compress and decompress the file using the same code, its perfect. If we encrypt and decrypt the file using the same class, its perfect. But if we do the combination of compression and encryption, the file is totally messed up. Any reasons? For the sake of testing, we did both the functionalities of recepient and despatch end in the same project... The code for above is here: Dim SecKey As String = "Tashgktt" Private Sub cmdComGZipped_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdComGZipped.Click Dim outfile, infile As FileStream Dim zipStream As GZipStream Dim sw As StreamWriter Dim sr As StreamReader Dim ms As MemoryStream Dim info As FileInfo infile = New FileStream("Y:\CreateTestPort3.txt", FileMode.Open, FileAccess.Read) outfile = New FileStream("Y:\TestGZipped.xip", FileMode.Create, FileAccess.Write) zipStream = New GZipStream(outfile, CompressionMode.Compress, False) sr = New StreamReader(infile) sw = New StreamWriter(zipStream) Do While Not sr.EndOfStream sw.WriteLine(sr.ReadLine) Loop sw.Close() sr.Close() zipStream.Close() ' important to close this first to flush compressed stream outfile.Close() ' important to close this second to flush output stream infile.Close() info = New FileInfo("Y:\TestGZipped.Xip") MsgBox(info.Length.ToString) '//Encrypt the file EncryptFile("Y:\TestGZipped.xip", "Y:\EncryptText.enc", SecKey) End Sub Private Sub cmdDecomGZipped_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdDecomGZipped.Click Dim outfile, infile As FileStream ' Dim ZipStream As GZipStream Dim sw As StreamWriter Dim sr As StreamReader Dim info As FileInfo '//Decrypt the file DecryptFile("Y:\EncryptText.enc", "Y:\DecryptText.XIP", SecKey) infile = New FileStream("Y:\DecryptText.XIP", FileMode.Open, FileAccess.Read) outfile = New FileStream("Y:\CreateTestPort3GOriginal.txt", FileMode.Create, FileAccess.Write) ZipStream = New GZipStream(infile, CompressionMode.Decompress, False) sr = New StreamReader(ZipStream) sw = New StreamWriter(outfile) Do While Not sr.EndOfStream sw.WriteLine(sr.ReadLine) Loop sw.Close() sr.Close() ZipStream.Close() ' important to close this first to flush compressed stream outfile.Close() ' important to close this second to flush output stream infile.Close() info = New FileInfo("Y:\CreateTestPort3GOriginal.txt") MsgBox(info.Length.ToString) End Sub Error : An unhandled exception of type 'System.IO.InvalidDataException' occurred in System.dll Additional information: The magic number in GZip header is not correct. Make sure you are passing in a GZip stream. The Encrypt/Decrypt is done by the following: Imports System.IO Imports System.Security.Cryptography Imports System.Runtime.InteropServices Imports System.Text Module EncryptDecrypt ' Call this function to remove the key from memory after it is used for security. <DllImport("kernel32.dll")> _ Public Sub ZeroMemory(ByVal addr As IntPtr, ByVal size As Integer) End Sub ' Function to generate a 64-bit key. Function GenerateKey() As String ' Create an instance of a symmetric algorithm. The key and the IV are generated automatically. Dim desCrypto As DESCryptoServiceProvider = DESCryptoServiceProvider.Create() ' Use the automatically generated key for encryption. Return ASCIIEncoding.ASCII.GetString(desCrypto.Key) End Function Sub EncryptFile(ByVal sInputFilename As String, _ ByVal sOutputFilename As String, _ ByVal sKey As String) Dim fsInput As New FileStream(sInputFilename, _ FileMode.Open, FileAccess.Read) Dim fsEncrypted As New FileStream(sOutputFilename, _ FileMode.Create, FileAccess.Write) 'Dim Key = sKey 'Dim IV = sKey Dim DES As New DESCryptoServiceProvider() 'Set secret key for DES algorithm. 'A 64-bit key and an IV are required for this provider. DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey) 'Set the initialization vector. DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey) 'Create the DES encryptor from this instance. Dim desencrypt As ICryptoTransform = DES.CreateEncryptor() 'Create the crypto stream that transforms the file stream by using DES encryption. Dim cryptostream As New CryptoStream(fsEncrypted, _ desencrypt, _ CryptoStreamMode.Write) 'Read the file text to the byte array. Dim bytearrayinput(fsInput.Length - 1) As Byte fsInput.Read(bytearrayinput, 0, bytearrayinput.Length) 'Write out the DES encrypted file. cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length) cryptostream.Close() fsInput.Close() fsEncrypted.Close() End Sub Sub DecryptFile(ByVal sInputFilename As String, _ ByVal sOutputFilename As String, _ ByVal sKey As String) 'Dim Key = sKey 'Dim IV = sKey Dim DES As New DESCryptoServiceProvider() 'A 64-bit key and an IV are required for this provider. 'Set the secret key for the DES algorithm. DES.Key() = ASCIIEncoding.ASCII.GetBytes(sKey) 'Set the initialization vector. DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey) 'Create the file stream to read the encrypted file back. Dim fsread As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read) 'Create the DES decryptor from the DES instance. Dim desdecrypt As ICryptoTransform = DES.CreateDecryptor() 'Create the crypto stream set to read and to do a DES decryption transform on incoming bytes. Dim cryptostreamDecr As New CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read) 'Print out the contents of the decrypted file. Dim fsDecrypted As New StreamWriter(sOutputFilename) fsDecrypted.Write(New StreamReader(cryptostreamDecr).ReadToEnd) fsDecrypted.Flush() fsDecrypted.Close() fsread.Close() cryptostreamDecr.Close() End Sub End Module Tag: certificazioni MCAD per il fmw 3.0 Tag: 124422
  - 10
    - combobox find item by value Is there any way in a combobox to find the index of an item or set the item in a combobox by the value? I know there is a FindString, and a FindStringExact method in the combobox object, but is there anything simmilar or any work around to getting the index of an object or setting the selecteditem by the value? Any help is appreciated, thank you. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124421
  - 11
    - Framework files location for compile On our development machines I created some batch file for compiling our web apps. They make use of some environment variables and batch files that visual studio installs. if "%VS80COMNTOOLS%"=="" goto error_no_VS80COMNTOOLS rem set path of aspnet_compiler for the framework in vs80 call "%VS80COMNTOOLS%vsvars32.bat" On my machine VS80COMNTOOLS=C:\Program Files\Microsoft Visual Studio 8\Common7\Tools\ vsvars32.bat sets a lot of environment stuff but, basically it puts into the path the location of aspnet_compiler and aspnet_regiis This is great because I don't have to hard code the path or worry about new paths if the framework gets upgraded. Unfortunately, I now need to compile on a computer which does not have VS installed. Thus no environment variables or vsvars32.bat file. Is their an automated way to get the most recent path to aspnet_compiler and aspnet_regiis? thanks, Tag: certificazioni MCAD per il fmw 3.0 Tag: 124419
  - 12
    - How do I Sleep for a specified amount of time and relinquish contr In the docs for Thread.Sleep() it appears unless I specify 0 my thread will still use the rest of its quanta (I guess doing nothing useful) as opposed to being suspended right away to allow other runable thread to execute. What's the best way to sleep for a specified amount of time and relinquish control right away as opposed to using up the rest of my quanta? Do I need to call the Win32 Sleep()? Do I need to call WaitOne() on a synchronization object? -- Thanks, Nick nicknospamdu@community.nospam remove "nospam" change community. to msn.com Tag: certificazioni MCAD per il fmw 3.0 Tag: 124418
  - 13
    - Howto Identify an Exception? Hi, For some procedures that throws exceptions, I would like to show different messages to the user depending on what type of exception he's getting. For instance this one: when the file is locked, I want a messagebox to tell that the user has to close the file first. Is there a way to identify an exception by some kind of unique number or something like this? I don't want to identify it on the Exception Message because some users are using French OS, and it'sj sutn ot right in my opinion :-) Thanks a lot in advance, Pieter Exemple of the exception: Exception Source: mscorlib Exception Type: System.IO.IOException Exception Message: The process cannot access the file 'C:\Documents and Settings\LBN\Desktop\Proforma.xls' because it is being used by another process. Exception Target Site: WinIOError ---- Stack Trace ---- System.IO.__Error.WinIOError(errorCode As Int32, maybeFullPath As String) Ghost.exe: N 2015149 System.IO.FileStream.Init(path As String, mode As FileMode, access As FileAccess, rights As Int32, useRights As Boolean, share As FileShare, bufferSize As Int32, options As FileOptions, secAttrs As SECURITY_ATTRIBUTES, msgPath As String, bFromProxy As Boolean) Ghost.exe: N 00998 System.IO.FileStream..ctor(path As String, mode As FileMode, access As FileAccess) Ghost.exe: N 00057 System.Windows.Forms.SaveFileDialog.OpenFile() Ghost.exe: N 00154 Microsoft.Reporting.WinForms.ExportDialog.PromptFileName(fileExtension As String) Ghost.exe: N 00369 Microsoft.Reporting.WinForms.ExportDialog.OnExportCompleteUI(result As ProcessThreadResult, data As Object) Ghost.exe: N 00116 Tag: certificazioni MCAD per il fmw 3.0 Tag: 124411
  - 14
    - How to script the creation of a client in DHCP Hello, I'm trying to create a program for automaticaly create a client in the dhcp. I can enumerate the subnets and clients but I can't create client... error 1783 I 'm usind the Dhcpsapi dll with the DhcpCreateClientInfo function. Can some one have an example please ? Thks Sam My code : VB 2005 Declare Unicode Function DhcpCreateClientInfo Lib "Dhcpsapi" (ByVal ServerIpAddress As String, ByRef ClientInfo As IntPtr) As Integer Private Structure DHCP_CLIENT_INFO Dim ClientIpAddress As Int32 Dim SubnetMask As Int32 Dim ClientHardwareAddress As DHCP_BINARY_DATA <MarshalAs(UnmanagedType.LPWStr)> _ Dim ClientName As String <MarshalAs(UnmanagedType.LPWStr)> _ Dim ClientComment As String Dim ClientLeaseExpires As DHCP_DATE_TIME Dim OwnerHost As DHCP_HOST_INFO End Structure <StructLayout(LayoutKind.Sequential)> _ Private Structure DHCP_BINARY_DATA Dim DataLength As Int32 Dim Data As IntPtr End Structure <StructLayout(LayoutKind.Sequential)> _ Private Structure Date_Time <MarshalAs(UnmanagedType.U4)> _ Dim dwLowDateTime As UInt32 <MarshalAs(UnmanagedType.U4)> _ Dim dwHighDateTime As UInt32 End Structure <StructLayout(LayoutKind.Sequential)> _ Public Structure DHCP_DATE_TIME Dim dwLowDateTime As Integer Dim dwHighDateTime As Integer End Structure Private Structure DHCP_HOST_INFO Dim IpAddress As Int32 <MarshalAs(UnmanagedType.LPWStr)> _ Dim NetBiosName As String <MarshalAs(UnmanagedType.LPWStr)> _ Dim HostName As String End Structure '************************************************************************ Sub Main() Dim new_dhcp_client As DHCP_CLIENT_INFO Dim new_dhcp_client_mac As DHCP_BINARY_DATA Dim mac_memory As MAC_INFO mac_memory.MAC5 = &H0 mac_memory.MAC4 = &HB mac_memory.MAC3 = &H5D mac_memory.MAC2 = &H9A mac_memory.MAC1 = &H5C mac_memory.MAC0 = &H3A Dim macArray(6) As Byte macArray(0) = mac_memory.MAC0 macArray(1) = mac_memory.MAC1 macArray(2) = mac_memory.MAC2 macArray(3) = mac_memory.MAC3 macArray(4) = mac_memory.MAC4 macArray(5) = mac_memory.MAC5 Dim pnt As IntPtr = Marshal.AllocHGlobal(6) Marshal.Copy(macArray, 0, pnt, 6) new_dhcp_client_mac.Data = pnt new_dhcp_client_mac.DataLength = 6 new_dhcp_client.ClientComment = "TEST BY SAM" new_dhcp_client.ClientName = "TESTBYSAM" new_dhcp_client.OwnerHost.HostName = "dhcpservername" new_dhcp_client.OwnerHost.IpAddress = -1633184056 new_dhcp_client.OwnerHost.NetBiosName = "dhcpservername" new_dhcp_client.SubnetMask = -256 new_dhcp_client.ClientHardwareAddress = new_dhcp_client_mac new_dhcp_client.ClientIpAddress = -1633184058 Dim xx As New IntPtr xx = Marshal.AllocHGlobal(Marshal.SizeOf(new_dhcp_client)) Marshal.StructureToPtr(new_dhcp_client, xx, False) Dim errortt As Integer = 0 errortt = DhcpCreateClientInfo("ipservername", xx) end sub Tag: certificazioni MCAD per il fmw 3.0 Tag: 124405
  - 15
    - .Net 3.0 Administrative Setup .Net 3.0 deployment via Active Directory and Group Policy seems pretty broken to me. The most up to date info I can find is in the RTM SDK under 'Microsoft .NET Framework 3.0 Administrator Deployment Guide'. The script at the bottom of that article ignores the WIC and XPS components of dotnetfx3.exe and the command to extract wcf.exe does not work. WCF.exe /? indicates there is no /c switch for wcf.exe. Could someone from MS have a look at this and provide a working script or other instructions on how to deploy with Group Policy? Thanks Michael Tag: certificazioni MCAD per il fmw 3.0 Tag: 124403
  - 16
    - Can't install hotfix for KB913384 Hello, I got the hotfix from customer support for KB913384. However, when I attempt to install, it says I'm missing the required software. IIS is installed, and I'm running Windows XP Pro SP2 and .NET 2.0.50727.0. It doesn't say what software is missing. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124401
  - 17
    - OE - nothing appears in message body I've been using Outlook Express for my Hotmail account for a long time. Suddenly it isn't working properly. It downloads messages into the inbox fine, but for some reason when I open a message I get the hourglass and no matter how long I wait nothing appears in the body of the message. I tried accessing the same hotmail account via OE on another computer and it works fine, so the problem is specific to the OE on this one computer. By coincidence I had downloaded IE7 the day this started happening, but I can't remember exactly if the problem started before or after the IE7 download. Any idea what is wrong and how to fix it? I've tried deleting and recreating the account in OE. That did no good. By the way, why isn't there an OE7 with IE7? My OE is still version 6. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124398
  - 18
    - convert DataColumn.GetType() into a DbType or SqlDbType? I have a DataColumn, want to derive the DbType. I can do column.GetType() but that's a system type, not a db type. How do I convert it to the corresponding type? Thanks much! Chris B. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124396
  - 19
    - TypeConverter and arrays Using asp.net1.1, I have a property on a control that is an enum. I use an accessor and set it in HTML view. So: public enum Permission { None = 0, Admin = 1, Member = 2, ... } ... public class Lock : System.Web.UI.Control { private Permission perm; [Bindable(true), Category("Security"), DefaultValue("1")] public Permission RequiredPermission { get { return perm; } set { perm = value; } } Then in html view: <cc1:Lock ... RequiredPermission="Admin" ... > Now, I want to make the Permission property an array of permissions: private Permission[] perm; My question is, how can I implement this to allow me to still specify the list of permissions in html view, like: <cc1:Lock ... RequiredPermission="Admin,Member" ... > I need to convert this list into an array, is there any way to do this within an accessor? If I try something like this, I get a parser error, saying it can't create an object of type Permission[] from its string representation. public Camelot.Permission[] RequiredPermission { get { return perm; } set { // break up comma delimited string in value, create an array of permissions, assign it to perm } } Thanks! Tag: certificazioni MCAD per il fmw 3.0 Tag: 124395
  - 20
    - Client -Server in Windows Applns... Hi All.., I have a VB.Net Windows Application.. I need to Run this Exe From Some Other System(Client) and I need to Upload some specified files to the Server System.. Now my doubts are.. 1) Is client-Server concept is Possible in Windows Applications.. 2) Can I pass some arguments to that exe.. from server.. Regards.., Ramesh.R... Tag: certificazioni MCAD per il fmw 3.0 Tag: 124390
  - 21
    - ClickOnce Deployment on Thin Clients for ALL users I am having a bit of a problem with my ClickOnce Deployment strategy for vb.net 2005 apps. I am working in a plant which has hundreds of thin clients and when I deploy an app using ClickOnce, it asks each individual user if they want to install. When updates are rolled out, it then asks each user if they want to get the newest version. Is there a way to deploy my apps globally to the terminal server instead of having to deploy to each individual session. I.E. Install at the Machine level and not the User level so that users are not bothered with the install / update question? Thanks in advance for you help! --kaz Tag: certificazioni MCAD per il fmw 3.0 Tag: 124389
  - 22
    - Application.ThreadException not working Hi, I have a shoddily written application that is written in 1.1 that I've ported to 2.0 and now occasionaly I get crashes which I suspect are been caused by exceptions in threads, most likely due to trying to access controls which is now stricter, I know I could just set CheckForIllegalCrossThreadCalls = false; But I'd rather like to understand a bit better about ways to handle these exceptions and diagnose them so have been playing with "Application.ThreadException" and "AppDomain.CurrentDomain.UnhandledException", the problem I have is "Application.ThreadException" never seems to fire and this is cunfusing the hell out of me. I have the following simple test code using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Threading; using System.Windows.Forms; namespace TestApp { public partial class Form1 : Form { public Form1() { InitializeComponent(); Application.ThreadException += new ThreadExceptionEventHandler(Application_ThreadException); AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); } void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) { MessageBox.Show("CurrentDomain_UnhandledException " + e.ExceptionObject.ToString()); } void Application_ThreadException(object sender, ThreadExceptionEventArgs e) { MessageBox.Show("Application_ThreadException"); } private void exceptionButton_Click(object sender, EventArgs e) { Thread t = new Thread(delegate() { int zero = 0; int x = 1 / zero; }); t.IsBackground = true; t.Start(); } private void crossThread_Click(object sender, EventArgs e) { Thread t = new Thread(delegate() { crossThread.Text = "Error"; }); t.IsBackground = true; t.Start(); } } } Which is just a windows form that has 2 buttons, crossThreadButton & exceptionButton, crossThreadButton simply creates a thread that tries to access a control it shouldn't, and exceptionButton simply divides by 0 to create a exception, both cause the "AppDomain.CurrentDomain.UnhandledException" event to be fired, but niether cause the "Application.ThreadException" event to be fired which is confusing me. When should "Application.ThreadException" get called, am I missing a setting or is it only for specific situations. Also is there a way to prevent the application from exiting when there is a exception in a thread and "AppDomain.CurrentDomain.UnhandledException" is fired, In my main shoddy app I'm 99.99% sure that exceptions in threads that have a long lifetime are handled and that these problems are been caused in shortlived threads that if they fail the work will simply be picked up on the next iteration, there is a reasonable amount of manual work involved in setting up and configuring the app and loosing all this is a pain for the user, if they could be informed of the error but allowed to continue that would be a lot easier for me while I find all the causes of the problem. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124387
  - 23
    - TimeZone.CurrentTimeZone doesn't update I'm seeing TimeZone.CurrentTimeZone accurately reflecting the machine time zone at the point that the assembly loads, but if the user subsequently changes the Windows time zone the value of TimeZone.CurrentTimeZone doesnâ??t change to reflect that. In other words, if the system is on PST when my assembly loads then whenever time I instantiate a TimeZone object (System.TimeZone tz = System.TimeZone.CurrentTimeZone;) the value of tz.StandardName returns "Pacific Standard Time" and tz.GetUtcOffset comes back as -08:00:00 - even if I change to Brisbane time (+10:00:00) Is there some trick to this that I'm missing? I've got an Outlook add-in that's passing date values to a web service. Even though it works in UTC internally, the SOAP proxy classes expect values in local time to which the parser then assigns an offset. The conversions to and from UTC continue to use the original offset even if the user changes time zones, which corrupts the data. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124380
  - 24
    - embed sqlexpress installation Hello I have an application, which is used to install sqlexpress in quit mode(no user interface). It is working properly. In that installation time i want to show some progress bar movement to the user. How I have to do this. Pl. give any solution. Regards, Raju. Tag: certificazioni MCAD per il fmw 3.0 Tag: 124379
  - 25
    - Bound ComboBox for browsing _and_ editing? Can I use a bound ComboBox for both browsing and editing? I'm working on a small, standalone database application using Visual C#.NET 2003 and an Access data file. In order to keep the number of different screens down to a minimum, I'm trying to use the same Windows Forms for both browsing and for updating. This works fine for TextBoxes, but I'm running into problems with my DropDownLists (ComboBoxes). Thre's nothing special about the (string) lists in these ComboBoxes. They're set up with DisplayMember="" and ValueMember="", they're defined inside the VS Designer, and they're a convenience to save the user from having to remember what the valid choices are; the choice, once made, would simply be stored into a text field... er, column. Or, at least, that's how I thought/hoped it would work. Trouble is, I can't figure out how to bind these ComboBoxes in a way that lets the user see the existing values as they browse with the bound TextBoxes and ComboBoxes disabled (Enabled=false), yet allows editing when these same controls are enabled. Binding my DataView to the ComboBoxs' "Text" property is tempting. It works very nicely for browsing; the current contents of the data columns are displayed properly as the user "scrolls" through the rows. When the control is enabled (for editing), the DropDownList displays properly, a choice can be made, and all appears well... until I attempt to update the database. According to the debugger, the controls _are_ bound, and a changed ComboBox _does_ have new (changed) contents in its Text property, but the supposedly bound data column never gets updated (again, per the debugger's display of my DataView with DataView.RowStateFilter = CurrentRows). (TextBoxes bound to the same DataView are working just fine.) Then there's binding to the ComboBox's SelectedValue Property (or possibly its SelectedItem -- even after reading the online documentation I'm not really sure what the difference is between these two). I tried this, but I lose the "browsing" feature -- when the ComboBox is disabled all that shows is either blanks or the last choice made when the control _was_ enabled. Late this afternoon, after spending another couple of hours with Google trying to find the keywords for a magical incantation that would take me directly to an explanation of this problem and a workaround -- and failing -- I tried something only moderately perverted: I bound the ComboBoxes' Text property and installed an event handler for their SelectionChangeCommitted events. My first attempt forcibly altered the Text property: private void cbx1_SelectionChangeCommitted(object sender, System.EventArgs e) { // Warning: reconstructed from memory ComboBox cbx = sender as ComboBox; string s = cbx.Text; cbx.Text = ""; cbx.Text = s; } Then I tried something that _seemed_ a little less klugy: private void cbx1_SelectionChangeCommitted(object sender, System.EventArgs e) { // Chose a new velue? ComboBox cbx; cbx = sender as ComboBox; cbx.Text = cbx.SelectedValue.ToString(); } This one works... mostly. It occasionally throws a "null reference" exception complaining that, in spite of the fact that the code is in an event handler set up for the case that a selection has been made, cbx.SelectedValue lacks a value. SelectedIndex: 1 selectedIndex: -1 SelectedItem: "Option 2" (second string from list) selectedValueChangedFired: true and the embedded ListControl has: SelectedIndex = 1 SelectedValue = <undefined value> (a.k.a. "Ka-boom!") I can't be the first person to ever try setting up a form with ComboBoxes to browse and edit a database. I keep feeling that I'm missing something simple, something that's so obvious to everyone that no-one bothers mentioning it. I did run across a note about VisualBasic ComboBoxes in the VS online documentation that might be relevant entitled: Data binding for ComboBox or ListBox is read-only but (a) it's not clear whether or not this note applies to VC#, and (b) the note's rather terse workaround merely says to Add code to the ListControl.SelectedValueChanged event for the ComboBox or ListBox controls to update the database. without providing any specifics. It's very frustrating: with the VS debugger I can see the ComboBox selection being stored into its Text property, but I can't seem to home in on where the ball gets dropped, that is, what stops that value from being stuffed into the DataView's current DataRow. Has anyone out there been down this road before? I'm hoping someone familiar with binding and ComboBoxes can either tell me that I'm going at the problem from a completely wrong direction, or possibly that my horribly ugly code is about the only way to accomplish what I'm trying to do. Any hints, suggestions, or clues will be appreciated. Frank McKenney -- A science is any discipline in which a fool of this generation can go beyond the point reached by a genius of the last generation. -- Max Gluckman -- Tag: certificazioni MCAD per il fmw 3.0 Tag: 124377

Quando verranno proposte le nuove certificazioni per il nuovo framework?

Re: certificazioni MCAD per il fmw 3.0 by FeDe

*FeDe*
Mon Nov 20 09:36:39 CST 2006

"*FeDe*" <noemail@please.it> ha scritto nel messaggio
news:%23gGHaiLDHHA.3524@TK2MSFTNGP06.phx.gbl...
> Quando verranno proposte le nuove certificazioni per il nuovo framework?
>

Opss sorry, I wrote in italian !!!
I was just asking about the MCAD certifications:
when will be avaible the new .net 3.0 certification procedure?
I'd like to be certificated, but at this point I think I'll wait the next
certification program !!!

Top

Re: certificazioni MCAD per il fmw 3.0 by Mubashir

Mubashir
Mon Nov 20 09:58:55 CST 2006

abey microsoft ki site per maloom ker, forum mein sala kiss ko pata hoga.
"*FeDe*" <noemail@please.it> wrote in message
news:%23$4zOlLDHHA.572@TK2MSFTNGP03.phx.gbl...
>
> "*FeDe*" <noemail@please.it> ha scritto nel messaggio
> news:%23gGHaiLDHHA.3524@TK2MSFTNGP06.phx.gbl...
>> Quando verranno proposte le nuove certificazioni per il nuovo framework?
>>
>
> Opss sorry, I wrote in italian !!!
> I was just asking about the MCAD certifications:
> when will be avaible the new .net 3.0 certification procedure?
> I'd like to be certificated, but at this point I think I'll wait the next
> certification program !!!
>
>

Top

Re: certificazioni MCAD per il fmw 3.0 by Mubashir

Mubashir
Mon Nov 20 10:03:20 CST 2006

oops i replied in urdu. You should better check microsoft.com I wonder
anyone from this forum would be able to answer this ......
"Mubashir Khan" <m@n.com> wrote in message
news:OY7gezLDHHA.3212@TK2MSFTNGP04.phx.gbl...
> abey microsoft ki site per maloom ker, forum mein sala kiss ko pata hoga.
> "*FeDe*" <noemail@please.it> wrote in message
> news:%23$4zOlLDHHA.572@TK2MSFTNGP03.phx.gbl...
>>
>> "*FeDe*" <noemail@please.it> ha scritto nel messaggio
>> news:%23gGHaiLDHHA.3524@TK2MSFTNGP06.phx.gbl...
>>> Quando verranno proposte le nuove certificazioni per il nuovo framework?
>>>
>>
>> Opss sorry, I wrote in italian !!!
>> I was just asking about the MCAD certifications:
>> when will be avaible the new .net 3.0 certification procedure?
>> I'd like to be certificated, but at this point I think I'll wait the next
>> certification program !!!
>>
>>
>
>

Top

certificazioni MCAD per il fmw 3.0

Re: certificazioni MCAD per il fmw 3.0 by *FeDe*

Re: certificazioni MCAD per il fmw 3.0 by Mubashir

Re: certificazioni MCAD per il fmw 3.0 by Mubashir

Re: certificazioni MCAD per il fmw 3.0 by FeDe