Version independent equivalent to the "is" operator...

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  - 1
    - Upgrade v1 to v2 Hi all I have just upgraded my Win 2k3 Server from v1 to v2 of .NET Framework to facilitate a website I have built using VWD2K5 Express. The files are there and then I created the website but I noticed it didnt look for v2 .NET files but the original v1. So I manually changed the ispai file to the v2 version. So I now dont get the error of wrong version, but now it says The resource cannot be located (HTTP 404), but the default.aspx file is definately there. Anyone know the answer? Rgds and thanks in advance Tag: Version independent equivalent to the "is" operator... Tag: 103659
  - 2
    - Com component in VS.net Hi, I have a question about a com component (.dll) in Visual studio .net. After I reference a com component, VS.net puts a wrapper on it and the new dll is in my bin folder. I notice that the com dll isnâ??t in that same folder. So, my questions are, after the wrapper is on the dll, do I still need the com component to run this app? If so, how can I tell after I reference the dll in my app what version and path the dll is coming from. And when I deploy this app, do I need to add the com component and register them? Thanks Andre Tag: Version independent equivalent to the "is" operator... Tag: 103654
  - 3
    - Can't retrieve appSettings Hello. I'm creating a class library. I've added an App.Config that looks like the file at the end of this email. I've tried just about everything to retrieve the ConnectionString in the classes constructor but have had no success - I get "Nothing". I'm going nuts. How do I get the connection string? Thanks in advance, Mike Here it is: <?xml version="1.0" encoding="utf-8" ?> <configuration> <appSettings> <add key="ConnectionString" value="Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=SessionState;Data Source=DPWEBDEVHOST;Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=DP2243;Use Encryption for Data=False;Tag with column collation when possible=False"/> </appSettings> </configuration> Tag: Version independent equivalent to the "is" operator... Tag: 103651
  - 4
    - InstallUtil.exe doesn't seem to honor <probing privatepath> settin I'm using Framework 1.1 and I'm having the following problem when trying to install a service. I have my auxilary assemblies in lower directory called Shared. I have specified the following in the app.config file: <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <probing privatePath="Shared" /> </assemblyBinding> </runtime> This works at runtime but for some reason if I attempt to register the assembly as a service I get the following error: The inner exception System.Reflection.ReflectionTypeLoadException was thrown with the following error message: One or more of the types in the assembly unable to load.. It is as if the assembly's dependencies aren't being probed correctly when using installutil.exe. This doesn't seem to make sense to me since I thought the probing was done in the CLR itself. Does anybody know what's wrong? Tag: Version independent equivalent to the "is" operator... Tag: 103649
  - 5
    - threading synchronization problem I have this kind of construct: Somewhere in thread 1 ------------------------------------------------- SyncLock _objTxRxSync 'code to set some values in _objTxRxSync object If _objSignal.WaitOne(1000, True) Then 'do stuff when other thread signals Else 'do stuff when timeout End If End SyncLock Somewhere in thread 2 ------------------------------------------------- SyncLock _objTxRxSync 'code to set some values in _objTxRxSync object _objSignal.Set() End SyncLock -------------------------------------------------------------------------- The problem is that thread 1 never gives up the lock on _objTxRxSync during the 1000ms wait for thread 2 to access. The documentation states that if the second parameter for the WaitOne method is set to True, the waiting threat should give up the lock of the sync context and reaquire it when signaled. Why does this not work? I am using .NET v2.0 latest release. Is this a bug? Thanks Perry Tag: Version independent equivalent to the "is" operator... Tag: 103646
  - 6
    - When to use Strong Names (sn.exe) Hi, I am new to COM's and I was wondering when do I use the sn.exe utility. I created an assembly in .NET (I did not create a strong name) and ran it using VB.NET and had no problems. Do I only use strong name when I have an older COM that integrates with .NET? Thank you in advance Ross Tag: Version independent equivalent to the "is" operator... Tag: 103644
  - 7
    - When to use Strong Names (sn.exe) Hi, I am new to COM's and I was wondering when do I use the sn.exe utility. I created an assembly in .NET (I did not create a strong name) and ran it using VB.NET and had no problems. Do I only use strong name when I have an older COM that integrates with .NET? Thank you in advance Ross Tag: Version independent equivalent to the "is" operator... Tag: 103643
  - 8
    - Window Service EventLog Hi, I am developing a windows service in c# and in the app I have three class's. The main one called Service1 and then two that I have added to the project. Now in the main one I created an eventlog. My service1 calls another class and I want to be able to write to that same eventlog but I error out when I call this writeentry method of the eventlog. What am I missing? I set a variable to the eventlog in question but not sure how I should set it so its not null in the called class. Jim Tag: Version independent equivalent to the "is" operator... Tag: 103635
  - 9
    - Error with a DataGridView [vbExpress 2005] hello, in first I had to ask you to be understanding with my speech, because I am French... ;o) i have a problem with a datagridview. in first, here the hierarchy of my model of data : - MS Access Database - Typed Dataset - BindingSource - DatagridView i fill the dataset with data from 3 tables of the database. posting and navigation function. but when i try to add a new row in database the datagridview raise an exception which says that "-1" index is not defined. i am not able to define from which this error comes. data are written correctly in database. i fill again the dataset successfully but the datagridview don't want to show it ! what I understand less, it's that the error occurs only when the binding source position was not modified. if i move bindingsource cursor before adding row, there is no problem ! thus with the launching of the application I cannot add of new line. :o( from where can this error come ? thanks a lot in advance, Mathieu Tag: Version independent equivalent to the "is" operator... Tag: 103628
  - 10
    - How to raise an event from my windows application to my windows service? Hi, I'm an experienced vb .net developer in windows forma. Now I'm trying to develop a windows service and I would like to know if it's possible to raise an event from a windows application developed by me to a windows service developed by me. I would like to do something like, when a user changes something inmy application I would like to fire an event to my windows service and make a log. Is this possible? If I'm not clear please make me know. Regards, Filipe Marcelino Tag: Version independent equivalent to the "is" operator... Tag: 103620
  - 11
    - windows forms and arguments Hi, i am writing a project that uses a treeview as its main application navigation for the many parts of the program. i have one part when i need to display customer information in a child window, i thought i would be able to overide the new() in the form but this returns an error. my question is what would be the best way off passing a argument from the treeview to a form that i want to open? can somebody point me in the right direction Many thanks Simon Whale Tag: Version independent equivalent to the "is" operator... Tag: 103619
  - 12
    - Socket Connection Hai...I have a socket program. Let say I have IP from 125 to 129. When this problem happens I get the following situation. I capture what ever is being send to the socket. #Error [9/14/2005 6:28:21 PM] [126.126.226.129] ::A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond Error: 5 [9/14/2005 6:28:44 PM] [126.126.226.129] ::A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond Error: 5 [9/14/2005 6:29:08 PM] [126.126.226.129] ::A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond Error: 5 [9/14/2005 6:29:31 PM] [126.126.226.129] ::A connection attempt failed because the connected #Error IP 129 is really communication down... But all other IP 125-128 is working.... and when use hyperterminal we can get connected and communicate with the device. But from the system we only see the communication down IP that is 129 as shown on the examples above. What happen to the data for 125 -128. I confirm that these device is running fine and is still connected but we cannot receive anything. Anyone knows why this happen? Is it a cache problem or a memory overflow problem in .Net? Please asists. Thank you. Tag: Version independent equivalent to the "is" operator... Tag: 103618
  - 13
    - System.OutOfMemoryException in EnterpriseServices We are experiencing an System.OutOfMemoryException in our application (see exception message below). We have a physical 3-tier environment. Server is Windows 2003 Server, client is Windows 2003 on Citrix, but problem also occcurs on Windows 2000 running both client and server process on teh same computer. Both configurations have sufficent free memory. The error is raised in the .NET Enterprise Services code, and is trapped in the client. The call sequence is as follows: 1-Client.DoSearch() 2-. 3-. 4-Try 5-DatasetObject = Server.Search() 6-Catch 7-ex message 8-Server.Search() 9-. 10-. 11-return DataSetObject Line 5 executes, server routine at line 8 ok, runs until line 11. Line 11 returns, and then client jumps to line 7 with OutOfMemory exception. It fails (mostly) consistently on a dataset object that is approximately 60mb, however I can make it also fail by constantly calling the Server.Search routine with smalling Datasets (i.e. 5mB) until it fails. It seems to me there is a problem in the memory management in the Enterprise Services code. I get the feeling that it is working with an upper limit of allocated memory, that is somewhat less than the memory available on the server. And maybe this has been fragmented. Any help much appreciated. Mark Stern Exception Message: ------------------- 10.08.2005 17:04:54 System.String RemoteDispatchNotAutoDone(System.String): Exception of type System.OutOfMemoryException was thrown. at System.EnterpriseServices.IRemoteDispatch.RemoteDispatchNotAutoDone(String s) at System.EnterpriseServices.RemoteServicedComponentProxy.Invoke(IMessage reqMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Kodavet.Business.BusinessObjectManager.Search(SearchRequest& srcRequest) at Kodavet.RegionalVetOfficeClient.Main.DoSearch(enmSearchType SearchType, String strSearchString, Filter& oFilter, DisplayOption& oDisplayOption) Tag: Version independent equivalent to the "is" operator... Tag: 103617
  - 14
    - Current framework version Hello, Can someone tell me whats the latest version of the .NET Framework 2.0? Is it still Beta 2 or maybe RC1? At PDC, people were given Visual Studio 2005 RC1, so I assume the version of the framework on that DVD is RC1, right? On the MSDN site, you can download only the Beta2 version. Is is safe enough to install Beta2 or RC1 version of the 2.0 Framework on the machine running 1.1? I know they can run together, but is it safe in this stage? Thanks. Tag: Version independent equivalent to the "is" operator... Tag: 103616
  - 15
    - httpWebRequest Protocol Violation Have a code sample to do a basic httpWebRequest, post some data and get an xml doc response. Works great in 1.1, tried with beta 2 and generates a Protocol violation, tried adding the useunsafeheader.... = true in the config, no help, actually created an assembly in 1.1 and used in 2.0 project and still had a protocol violation. The stacktrace looks like its in the WebResponse.CheckProtocol() I am confused why this works in 1.1 and not 2.0, are their additional configuration options for 2.0. Thanks, Brian Tag: Version independent equivalent to the "is" operator... Tag: 103609
  - 16
    - Why garbage collector? This might sound stupid, but I really need to know why we need another language with garbage collector? With C++ destructor, everything get destroyed without to worry about them. And because memory is not the only system resources, the concept of destructor fits well into object oriented programming practise. For instance, if Java with reference counting and without GC exists: // With destructor and reference counting try { Statement stmt = conn.createStatement(); ResultSet rs = stmt.query("SELECT * FROM table"); // Do something } catch (Exception e) { // handle exception // rs and stmt went out of scope and destroyed } // With garbage collector Statement stmt = null; ResultSet rs = null; try { Statement stmt = conn.createStatement(); ResultSet rs = stmt.query("SELECT * FROM table"); // Do something } catch (Exception e) { // handle exception } finally { rs.close(); // What if createStatement() throws an exception and rs is null??? stmt.close(); // Can you be sure that stmt is not null??? } As you can see, GC only free programmers from handling memory but force programmers to worry about other resources like file, database connection, socket connection, etc. Why don't they implement a reference counting language instead? We don't need another language like Java. Tag: Version independent equivalent to the "is" operator... Tag: 103606
  - 17
    - creating .msi question. Hi, I would like to create .msi file that asks for product key/activation key/ licensing key for my class library. My plan is to provide a licensing key during the installation of my class library and validate its usage at run-time. Can you suggest me, how I can do this with Visual Studio.NET 2003. Cheers, Naveen. Tag: Version independent equivalent to the "is" operator... Tag: 103605
  - 18
    - Anyone know how to add a "Debug window" in own app Hi, guys we all using the VS.net IDE's debug window, such as "Watch window", "Auto window". but anyone know is any way or API provided for us to include a debug window in our own app? looking forward the replied, thanks guys -- Can You?You Can. Tag: Version independent equivalent to the "is" operator... Tag: 103601
  - 19
    - [Thread-Safety] Lock Object I have an application log file class which is used throughout the app, potentially by multiple threads. It's a singleton. Here're the relevant parts: sealed class LogFile { #region Singleton functionality public static readonly LogFile Instance = new LogFile(); static LogFile() { } #endregion StreamWriter streamWriter; readonly object streamWriterLock; LogFile() { #if TRACE streamWriterLock = new Object(); FileStream fileStream = File.Open(...); lock (streamWriterLock) { // lock for write memory barrier // (not sure whether this is needed) streamWriter = new StreamWriter(fileStream, Encoding.ASCII); } #endif } public void AddEntry(string text) { #if TRACE lock (streamWriterLock) { streamWriter.WriteLine(text); streamWriter.Flush(); } #endif } } Now, obviously I lock in AddEntry for atomic writing to the file. But my question is: should /streamWriterLock/ be volatile? There could be a situation where, for example, thread A and thread B are both running, and thread A accesses Instance thus creating the instance. Then thread B accesses it. Would thread B definitely see the right value for /streamWriterLock/ in this case? Tag: Version independent equivalent to the "is" operator... Tag: 103599
  - 20
    - al.exe question. Hi, By some reason al.exe tool is missing from my .NET 1.1. How I can get it. Kindly let me know. Cheers, Naveen. Tag: Version independent equivalent to the "is" operator... Tag: 103590
  - 21
    - Build Problems Hello, I have 4 aspx pages in a solution, 2 of which rely on a particular version of a third party assembly. i.e. they need to utilise properties which are in one assembly version, but not another. I was wondering if I could use a compiler directive around the setting of those properties, so the solution can build irregardless of which assemblies are present, and the system run the version of the aspx based on configuration settings derived elsewhere at run time. My compiler currently returns this error when the incorrect version of the assemblies are used: error BC30456: 'XYZ' is not a member of 'blah.blah.blah'. Anyone have any great ideas for getting this working? Any help would be appreciated Roger Tag: Version independent equivalent to the "is" operator... Tag: 103587
  - 22
    - HTML Email support? Does the .net framework provide any support for creating HTML Email messages? Tag: Version independent equivalent to the "is" operator... Tag: 103584
  - 23
    - Full .NET Framework 1.1 Service Pack 1 Installation The only way I was able to install the .Net service pack 1 was by first installing the regular .Net 1.1 framework (24 megs) and then on top of that install the service pack (10 megs)! Is there a link where I can download the full .Net 1.1 framework that includes the service pack 1 as part of the installation (one single istall)? Thanks Tag: Version independent equivalent to the "is" operator... Tag: 103581
  - 24
    - Difference between Framework 1.1 and 2.0 I was trying to find an article or site showing the differnces between 1.1 and 2.0. Could not find one. Do you guys know of any?? The reasons are one for personal knowledge and the other to see if there are going to be changes in the MCSD Exams. Anything will be great. Tag: Version independent equivalent to the "is" operator... Tag: 103580
  - 25
    - .NET 2.0 Configuration and arbitrary config files. Greetings, I have a requirement in an ASP.NET application to load configuration information from an arbitrary location outside of the web root. Specifically, the customer wants to create multiple virtual directories that all point to the same physical directory containting the ASP.NET application files. Each virtual-directory-instance should load its configuration information from a location outside of the web root, based on the name of the virtual directory it is running from. That way, they can have multiple instances of the application connecting to different databases, without duplicating all of the program files. My question is, in .NET 2.0 does the System.Configuration namespace provide a way to accomplish this? Can I just pass it the path to the config file I want it to load? Perhaps with a custom WebConfigurationFileMap or something? I looked at OpenExeConfiguration, which seems to be the only overload of anything related that accepts a path parameter, but it doesn't work. It returns a default Configuration object instead of one representing the config path I passed in. From what I can tell in the documentation, this method is expecting the path to an EXE, not the path to a config file. Or am I going to be forced to write my own configuration system because System.Configuration lacks this flexibiliity? Thanks, Joel Tag: Version independent equivalent to the "is" operator... Tag: 103577
- Next
  - 1
    - how to execute a dos command through C# ASP.net without using Proc I want to execute a .exe file through my ASP.Net C# .Net framework 1.1 application with user "X" credential. i used impersonationContext ( see notes at http://support.microsoft.com/?id=306158#4) to accomblish this. I pretty sure that this concept of imperonation works. Since Process.Start always uses the security context of the parent ASP.NET process(which is domainName\ASPNET), my impersonation is no use with Process. Do anbody know how to execute a .exe file without using Process (Diagnostics). with the current thread impersonated user? Thanks Avasi Tag: Version independent equivalent to the "is" operator... Tag: 103570
  - 2
    - ArrayList vs CollectionBase Hello, Can anyone help me in deciding between ArrayList and CollectionBase. I know that CollectionBase is an Abstarct Class unlike AarryList . Are the any benifits/Advantages using CollectionBase rather than Arraylist? -- Thanks nLella Tag: Version independent equivalent to the "is" operator... Tag: 103568
  - 3
    - impersonationContext vs Process (Diagnostics) somebody help. I want to execute a .exe file through my ASP.Net C# .Net framework 1.1 application with user "X" credential. i used impersonationContext ( see notes at http://support.microsoft.com/?id=306158#4) to accomblish this. I pretty sure that this concept of imperonation works. Since Process.Start always uses the security context of the parent ASP.NET process(which is domainName\ASPNET), my impersonation is no use with Process. Do anbody know how to execute a .exe file without using Process (Diagnostics). with the current thread impersonated user? Thanks Avasi Tag: Version independent equivalent to the "is" operator... Tag: 103567
  - 4
    - C# Multi-Threading Lock Issue I have a server application. This application has two pieces of shared data. They are both hashtables. The untroubling hashtable holds the clients data. The hashtable that is giving me grief represents a list of all of the clients connected to the server. Periodically I go through the client list (a.k.a, the irritating hashtable) using an enumeration to make sure they are still active. The code looks like this: IDictionaryEnumerator i = ClientList.GetEnumerator(); while (i.MoveNext()) { ClientKeepAliveHandler handler = null; try { handler = (ClientKeepAliveHandler)((object[])i.Value)[1]; IAsyncResult ar = handler.BeginInvoke(new AsyncCallback(this._asyncCallBack), i.Entry); } catch (System.Exception ex) { _writeError((int)i.Key,ref ex,MethodBase.GetCurrentMethod().Name); } } Now, this iteration continues happliy along and as the asynchronous call comes back the _asyncCallBack function gets called that looks like this: DictionaryEntry clientData = (DictionaryEntry)ar.AsyncState; ClientKeepAliveHandler del = null; try { del = (ClientKeepAliveHandler)((object[])clientData.Value)[1]; del.EndInvoke(ar); } catch (Exception ex) { ClientKeepAlive -= del; Exception e = new Exception("Client to be disconnected (most likely due to inaccessibility).", ex); _writeError((int)clientData.Key, ref e, MethodBase.GetCurrentMethod().Name, "SessionId: " + clientData.Key.ToString() + ", Inner Message: " + e.InnerException.Message); CloseSession((int)(clientData.Key)); } Now, if a client cannot be reached (as in un graceful shutdown) the EndInvoke method raises an exception of "The remote machine doesn't like you" or something like that. If that happens the code jumps to the error handler, removes the delegate from the invokation list of the classes KeepAlive event and sends an email to the developers who may have random bugs in there code. Then the last line of the error handler closes the session and removes the clients data. Keep in mind while this code is executing the original code that started this may still be looping through the hashtable sending off asynchrounous calls (and is whenever I experience the problem I'm about to describe). That being said, when the CloseSession function removes an item from the Hashtable the enumeration bombs with a "oh no the hashtable has changed" error, as it should. Now that I have explained all that the question: How should I implement locking? The behavior I want is the _asyncCallBack functions should all wait until I finish looping before even being able to call EndInvoke. So I tried implementing this in many ways. lock(ClientList), lock(ClientList.SyncRoot), Hashtable SyncedHash = Hashtable.Synchronized(ClientList) with a lock(SyncedHash), Monitor.Enter/Exit, lock(SomeRandomObjectForLocking) all seem to not work. To be clear, I placed the lock statements right before ClientKeepAlive -= del in the _asyncCallBack function and right before IDictionaryEnumerator i = ClientList.GetEnumerator() in the original snipped...help? Tag: Version independent equivalent to the "is" operator... Tag: 103564
  - 5
    - ComboBox bug? Could someone explain why the items property is not valid unless the control is added to a form? In the sample below the before == 0 and after == 2. DataTable table = new DataTable("Bool"); table.Columns.Add( "id" ); table.Columns.Add( "val" ); table.Rows.Add( new object[]{ "0", "False" } ); table.Rows.Add( new object[]{ "1", "True" } ); ComboBox comboBox = new ComboBox(); comboBox.DataSource = table; comboBox.DisplayMember = "val"; comboBox.ValueMember = "id"; int before = comboBox.Items.Count; Controls.Add( comboBox ); int after = comboBox.Items.Count ; Tag: Version independent equivalent to the "is" operator... Tag: 103557
  - 6
    - Shared constructor not called before Shared method I have a base class with several derived classes (I'm writing in VB.NET). I want each derived class to have a unique class ID (a String), and I want the derived classes to inherit from the base class *Shared* methods which make use of the class ID. So I gave the base class a classID field, and then I gave the derived classes Shared constructors, which I used to set the classID field to the appropriate values for each derived class. But this doesn't work! In the example below the method DerivedClass.PrintClassID() prints the class ID for the base class, rather than the derived class. So the Shared constructor for the derived class, which is needed to properly initialize the inherited Shared methods of that class, is not getting called. However if I create an instance (xyz in the example) of the derived class the Shared constructor *does* get called, even if I do nothing with the class instance. This just seems wrong. One would expect that the Shared fields of a class should get initialized before any class Shared methods get called, and that this initialization should not depend on the creation of an actual instance of the class. So what is going on? Is this an outstanding bug, or a misfeature that people have resigned themselves to living with, or have I simply misunderstood a feature? And what should I do to get the result I want? I can Shadow the PrintClassID method, and then it works as expected. But I don't want to have to Shadow every method which uses the classID field -- the whole point was that all that functionality was to be handled entirely by the base class, without the derived classes needing to know anything abou it. Any thoughts? '===== Begin Example ===== Imports System Class BaseClass Protected Shared classID As String = "BaseClass!" Public Shared Sub PrintClassID() Console.WriteLine("classID = " & classID) End Sub End Class Class DerivedClass Inherits BaseClass Shared Sub New() classID = "DerivedClass!" End Sub End Class Module TestModule Public Sub Main() 'Dim xyz As New DerivedClass DerivedClass.PrintClassID() End Sub End Module '===== End Example ===== -- John Brock jbrock@panix.com Tag: Version independent equivalent to the "is" operator... Tag: 103545
  - 7
    - Com object Garbase disposal Hi all, I'm working on a web app that uses a client-designed com dll to access a database, do calculations, etc. When I create a new object from this dll it takes up a lot of memory, so I want to get rid of it asap. My code looks similar to the following" Dim obj as new COMobj .... Do Processing ..... obj = Nothing gc.collect As you can see, I'm setting the object that I create to nothing and calling the garbage collector, which, in my mind, should release the allocated memory. While watching the task manager however, this does not appear to be happening until about 20 minutes afterwards, around the time that the web session would expire. How can I force the memory for this object to be released. Once again, this is not a .NET assembly, this is a COM dll. Any help would be very appreciated. Thanks in advance, Matt Tag: Version independent equivalent to the "is" operator... Tag: 103543
  - 8
    - Interace questions I'm new to dealing with interfaces. I'm not sure what is wrong with this. I get an System.InvalidCastException when I try to run it. I setup 2 classes with the same interface, then try to cast one into the other. Shouldn't all the common interface fields cast into the other? I'm sure I'm doing something stupid. Thanks for your help!!! Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim class1 As New ClassA("1") Dim class2 As New ClassB 'I get an "System.InvalidCastException" ??? Why???? class2 = CType(class1, IMyCommonStuff) End Sub End Class Public Interface IMyCommonStuff Property PropertyA() As String Function MethodA() As String End Interface Public Class ClassA Implements IMyCommonStuff Public Sub New(ByVal propertyA As String) _PropertyA = propertyA End Sub Public Function MethodA() As String Implements IMyCommonStuff.MethodA Return "In Mehtod A" End Function Dim _PropertyA As String Public Property PropertyA() As String Implements IMyCommonStuff.PropertyA Get Return _PropertyA End Get Set(ByVal Value As String) _PropertyA = PropertyA End Set End Property End Class Public Class ClassB Implements IMyCommonStuff Public Function MethodA() As String Implements IMyCommonStuff.MethodA Return "some stuff" End Function Dim _propertyA As String Public Property PropertyA() As String Implements IMyCommonStuff.PropertyA Get Return _propertyA End Get Set(ByVal Value As String) _propertyA = Value End Set End Property Dim _anotherClassBProperty As Integer Public Property AnotherClassBProperty() As Integer Get Return _anotherClassBProperty End Get Set(ByVal Value As Integer) _anotherClassBProperty = Value End Set End Property End Class Tag: Version independent equivalent to the "is" operator... Tag: 103542
  - 9
    - New user to VB .net 2003 I'm a new user to VB.net and am having problems when I create the binary executable and take it to a system that does NOT have VB .net it will not work stating that mscorwks.dll is missing. Is this a normal message? It not only appears in VB.net but in C#.net too. What am I doing wrong? Thank you for any help.... Cindy Tag: Version independent equivalent to the "is" operator... Tag: 103536
  - 10
    - Using .NET Remoting with multiple users I am developing a client/server app and would like to use .NET Remoting to allow the server to communicate with clients. I've been able to test this with a single client, but .NET Remoting seems to make it very difficult to establish connections with multiple users. This is the code I use for connecting a single user: IDictionary props = new Hashtable(); props["port"] = "0"; props["name"] = RemoteMachineName; TcpChannel channel = new TcpChannel(props, null, null); ChannelServices.RegisterChannel(channel); RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject), "tcp://" + RemoteMachineName + ":9999/ExamProctor/RemoteObject"); This works fine and allows be to connect to the remote object as expected. When I try to connect another user, the call to RegisterWellKnownClientType fails indicating that the remote object has already been redirected. Is there any way to use .NET Remoting to establish remote objects on multiple clients? Tag: Version independent equivalent to the "is" operator... Tag: 103534
  - 11
    - NetworkStream.BeginRead() wierdness I have a class that wraps a TcpClient object and manages all the async reading of the socket. It works really nice, and I use it all over the place. But there's this ONE INSTANCE where I create one of these things and it WON'T read data. If I set a breakpoint in my EndRead callback, it never goes off. NOTHING is different from anywhere else I use this class, its just this one place. Now, if I create a second constructor for my class that DOESN'T start off the async reading process (basically, never calls BeginRead()), subsequent Read()s will receive data. Additionally, if I do a loop like this: while(!networkStream.DataAvailable) Sleep(250); networkStream.BeginRead(...) Then the class works like it does everywhere else. Its like, in this one instance (and this instance isn't any different than anywhere else I use this class), I can't just do a BeginRead() and wait for data to come in. I have to loop and check DataAvailable before calling BeginRead(). Any suggestions? Tag: Version independent equivalent to the "is" operator... Tag: 103523
  - 12
    - HOWTO: find the process an object belongs to Hi, does anyone know how to find the System.Diagnostics.Process an object belongs to? The object could be a COM object. Thanks, Chris. Tag: Version independent equivalent to the "is" operator... Tag: 103522
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    - Windows Service app and the keyboard I want to write a .Net Windows service app that monitors any and all keyboard activity and blocks certain keys. Is this possible? -- Peter Aitken Remove the crap from my email address before using. Tag: Version independent equivalent to the "is" operator... Tag: 103517
  - 14
    - Throw Exception from Custom Attribute Could someone please tell me how to do the following: I have a custom Atrribute class that I was hoping to check something in the constructor and return an exception if not met...kind of like with security ie: Sub New(ByVal check As Boolean) Throw New Exception("No, cant do it") End Sub But i dont seem to be able to throw exceptions from the constructor... am i missing something? How does the SecurityAction.Demand stuff do it? thanks... Tag: Version independent equivalent to the "is" operator... Tag: 103513
  - 15
    - Detect txt open file Hi, I would like to know if it's possible to know if a text file is opened. Thanks in advance for your help. Regards, Filipe Marcelino Tag: Version independent equivalent to the "is" operator... Tag: 103510
  - 16
    - The process cannot access the file because it is being user by another process Hi I use FileSystemWatcher for watching xml file. File is changed by control in design time. After file is changed Changed event raises from FileSystemWatcher. In the handler of this event I try to load file to XmlDocument During this action an exception raises with the message in the subject. I guess UI thread is busy with my file when event handler tries to access the file. Somehow event handler works one more time and this time it's okay. Tell me please how can I find out if the file is free to access or wait until it's free? How can I workaround this issue to have no exception(.NET takes some time to handle it...)? thnx, InK_ Tag: Version independent equivalent to the "is" operator... Tag: 103509
  - 17
    - Deploy asp.net enterprise library application Hi, I have built an c# asp.net application on my laptop, it uses the Enterprise Library blocks - Data Access Application Block, Configuration Application Block. I now want to deploy my application on a server. It does not have the Enterprise Library installed. I have the following files referenced in my project - Microsoft.Practices.EnterpriseLibrary.Common.dll, Microsoft.Practices.EnterpriseLibrary.Configuration.dll, Microsoft.Practices.EnterpriseLibrary.Data.dll The reference for each points to C:\Program Files\Microsoft Enterprise Library June 2005\bin\... I have the "Copy Local" property set to true. Each of the above files appear in the bin directory of my project. The question : To deploy my project to the server (which does not have the enterprise library) can I : 1. just copy the bin directory of my project and .aspx files to the server. 2. Do I _HAVE TO_ install and build the enterprise library on the server. 3. Some other option? Thanks, Bryan Tag: Version independent equivalent to the "is" operator... Tag: 103508
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    - FileLoadException when loading .NET exe Hi, I don't know whether I am posting in the right newsgroup. I am using beta 2 of the 2.0 framework and I get an error when I load an exe file: Unhandled Exception: System.IO.FileLoadException: Could not load file or assembl y 'Conversion.Elm, Version=1.0.2088.25224, Culture=neutral, PublicKeyToken= null' or one of its dependencies. This application has failed to start because t he application configuration is incorrect. Reinstalling the application may fix this problem. (Exception from HRESULT: 0x800736B1) File name: 'Igss.Conversion.Elm, Version=1.0.2088.25224, Culture=neutral, Public KeyToken=null' ---> System.Runtime.InteropServices.COMException (0x800736B1): Th is application has failed to start because the application configuration is inco rrect. Reinstalling the application may fix this problem. (Exception from HRESUL T: 0x800736B1) at Cnv6Ixnet.Program.Main(String[] args) The exe file is dependent on Conversion.Elm.dll which resides in the same directory as my exe. The exe works fine on other machines. Conversion.Elm.dll is dependent on other dll's which in turn are dependent on Indigo. I've tried with Dependency Walker (depends.exe), fuslogvw.exe and Reflector to see if I have missing dependencies but I cannot find any. I hope someone can help me. /Chris Tag: Version independent equivalent to the "is" operator... Tag: 103506
  - 19
    - Licensing question Hi, I have created a library, MyLibrary.dll by using C#.NET 2003. I'm using Visual Studio.NET 2003 IDE. I would like to create a simple licensing sceme for its usage. Could you suggest me a good starting point for this. At the moment, I'm trying in the following way, as mentioned in one of the articles I went through, [LicenseProvider(typeof(LicFileLicenseProvider))] public class MyClass { private License lic = null; public MyClass() { lic = LicenseManager.Validate(typeof(MyClass)); Console.WriteLine("Testing"); } public void Dispose() { if(lic !=null) { lic.Dispose(); lic = null; } } } What is the next step.. Kindly let me know. Cheers, Naveen. Tag: Version independent equivalent to the "is" operator... Tag: 103499
  - 20
    - how to get the number of milliseconds between two System.DateTime objects how to get the number of milliseconds between two System.DateTime objects Tag: Version independent equivalent to the "is" operator... Tag: 103487
  - 21
    - Writing to a BinaryWriter Newbie question: How do I write a DateTime object to a BinaryWriter ? And then, how do I read it from a BinaryReader ? Thanks. _____ Marco Tag: Version independent equivalent to the "is" operator... Tag: 103486
  - 22
    - adding a value to a string Hi guys, I wanted to knwo if it was possible to add a value to a string, I have a field in my access table case_no which is of type TEXT, and want to add a value, here is teh code, Dim rs rs = conn.Execute("SELECT MAX(case_no) AS num FROM tblEvent WHERE LEFT(case_no, 4) = '" & TEMP & "' ") 'IF IT's NULL THEN MAKE IT = 1 if (trim(convert.tostring(rs("num"))))="0" then case_no = TEMP & "00001" else rs.Movefirst case_no =trim(convert.tostring(rs("num"))) Response.Write (trim(convert.tostring(rs("num"))) & "<br>") case_no = case_no+ 1 response.Write(case_no) end if rs.close Now even if i change case_no to a number, it doesnt work , I am not sure as to how to proceed, i am converting this asp app to asp.net. Any help is appreciated. PS: I tried posting the same topic but couldnt go thru , henc eif this repeats, I apologise Tag: Version independent equivalent to the "is" operator... Tag: 103474
  - 23
    - Multiple Network Adapter issues Our application is running on computers with multiple connections like Wi-Fi / 1x / Lan etc. How can we know which adapter is currently use by WebServices Call. We use .Net 2.0 framework. Thanks, -- Dany Couillard, ing. Tag: Version independent equivalent to the "is" operator... Tag: 103472
  - 24
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  - 25
    - Drag and Drop onto String in TextBox If I drag and drop onto a string in a textbox, how do I know programmatically the location within the string where the cursor is hovering. Let's say the string is "the cat " If the cursor hovers at the end of the string, I want to add some text there. But if the cursor/mouse drop is right before the word cat, I want to be able to add some new text right before the word cat. Tag: Version independent equivalent to the "is" operator... Tag: 103466

What is the best way to find out if a certain object implements any version
of a specific interface?

I have a plugin system in which plugins implement interfaces stored in
strongly named assembly in the GAC.
The plugins, which are dynamically loaded by the host, could potentially
reference any version of that assembly.

Do I need to manually search through the Assembly.GetReferencedAssemblies
and compare based on Name+PublicKey?
And once I confirm that it implements the interface, can I only use
reflection to call its members?

Nathan

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Re: Version independent equivalent to the "is" operator... by Mattias

Mattias
Thu Sep 22 00:54:48 CDT 2005

Nathan,

>And once I confirm that it implements the interface, can I only use
>reflection to call its members?

Yes. Wouldn't it be easier to use binding redirects or publisher
policy to redirect all previous versions of the plugin assembly to the
latest one, and then just use the is operator and call through the
interface?

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

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