best place to save application state?

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  - 1
    - Retrieving account starting service Iâ??m trying to write an application to enumerate all the services running on all of the servers in the company I work for. Iâ??ve got it working except that I have not been able find how to pull the account that starts the service. This is important because once I know this info for all the servers, I have to write an app that will periodically change the passwords used by the accounts starting these services. I donâ??t want to logon to all of these servers individually to do this. Iâ??ve been able to get the information from many of the servers by pulling the info from the registry, but many of the servers have remote registry disabled. Tag: best place to save application state? Tag: 93963
  - 2
    - Directory Question Hi I am using the Directory object in the System.IO Namespace. When I use the following code It gives me Object reference not set to an instance of an object. Can Anyone tell me what I am doing wrong? The line is Direcotry.exists("C:\") Thanks Kiran Kumar Tag: best place to save application state? Tag: 93949
  - 3
    - how to check sql didn't return anything? hi! I'm new to asp.net How do you check sql did not return anything? i mean like if i have an sql like this: myCom as New OledbCommand("select * from product where id='sdf'",myConn) then if there's no product with id sdf, how do i check from myCom? any idea of what should i do? ------------------- then just wondering how do you check that in dataset (let's say ds.tables ("product")) there is no row? I kept getting this error: Server Error in '/u0201098' Application. ---------------------------------------------------------------------------- ---- There is no row at position 0. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IndexOutOfRangeException: There is no row at position 0. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [IndexOutOfRangeException: There is no row at position 0.] System.Data.DataRowCollection.get_Item(Int32 index) +63 PartyHouse.searchcatalogue.search_Click(Object s, EventArgs e) System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent (String eventArgument) +57 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain() +1292 Please help... Thanks.. -- Message posted via http://www.dotnetmonster.com Tag: best place to save application state? Tag: 93945
  - 4
    - DB_E_OBJECTOPEN when calling DB2 after .NET Framework 1.1 SP1 We recently installed .NET Framework 1.1 Service Pack 1 (SP1) (KB867460) on a Windows 2003 Server Standard Edition. This server hosts an ASP.NET Web site that talks to an IBM DB2 8.1 database using the System.Data.OleDb classes. After installing the service pack, we began receiving System.Data.OleDb.OleDbException exceptions for certain types of queries. After we rolled back the service pack, the exceptions disappeared. With the service pack applied, the exceptions are consistent. That is, certain queries will always throw the exception, but other queries will never throw the exception. The error message is as follows: No error information available: DB_E_OBJECTOPEN(0x80040E05). The relevant portion of the stack trace: at System.Data.OleDb.OleDbDataReader.ProcessResults(Int32 hr) at System.Data.OleDb.OleDbDataReader.NextResult() at System.Data.Common.DbDataAdapter.FillNextResult(IDataReader dataReader) at System.Data.Common.DbDataAdapter.FillFromReader(Object data, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue) at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords) at System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) In case it's of use, here is some detailed information about the DB2 client software version: C:\Program Files\IBM\SQLLIB\BIN>db2level DB21085I Instance "DB2" uses "32" bits and DB2 code release "SQL08015" with level identifier "02060106". Informational tokens are "DB2 v8.1.5.449", "s040212", "WR21334", and FixPak "5". Product is installed at "C:\PROGRA~1\IBM\SQLLIB". We would really like to apply SP1 for the enhanced security, but at this point we're not sure how to make our application work with the service pack in place. Any suggestions would be appreciated. Tag: best place to save application state? Tag: 93943
  - 5
    - CDO.Message object error I am not sure if this is the best group for this problem, but here goes. I have a Windows application that has been running fine on about 40 machines for over a year. It uses behind the scene emails (borrowing System.Web.Mail to do so) to notify people of the need to do their part of the process. The application was just installed on a WinXP system and the behind the scene emails fail to send. The system is up to-date on all Windows patches. It gets an error to the effect: System.Web.HttpException: could not access 'CDO.Message' object. --> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation, --> System.Runtime.InteropServices.COMException (0x80040213): The transport failed to connect to the server. This problem has never occurred on any other machine. Any help is greatly appreciated. Tag: best place to save application state? Tag: 93941
  - 6
    - Newbie Question: Trust an Assembly Wizard Hi. Under the Microsoft .Net 1.1 Wizards there are 3 wizards: 1) Adjust .Net Security 2) Trust an Assembly 3) Fix an application. I want to use the Trust an Assembly wizard to trust several assemblies (from a network share). However, it seems to insist that I only select one assembly at a time. Is there any way that I can use wildcards or something to trust all assemblies in a particular application directory? Tag: best place to save application state? Tag: 93938
  - 7
    - 'PlatformNotSupportedException' I encountered 'PlatformNotSupportedException' when i try to get DataSet from my remote server. could anyone guild me through this error? please .. Posted at: http://www.groupsrv.com Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com Tag: best place to save application state? Tag: 93935
  - 8
    - re:'PlatformNotSupportedException' additional info, i developed a pocket pc application using VB.NET. My ppc is running Win CE 2003 ver.4.20 Posted at: http://www.groupsrv.com Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com Tag: best place to save application state? Tag: 93934
  - 9
    - Possible to sort a virtual listview? I been checking into the idea of a virtual listview. This means, no items are actually stored in the listview. It's more or less a container which draws the items based a source of data. An example can be found on http://www.windowsforms.com/ControlGallery/ControlDetail.aspx?Control=214&tabindex=9 Thus, the ListView Item comparer / listview item sorter method will not work to sort when you click a column. any ideas? Tag: best place to save application state? Tag: 93929
  - 10
    - HttpWebRequest and pipelining The httpWebRequest class supposedly supports HTTP 1.1 pipelining. I wasn't able to figure out how to send multiple GET requests pipelined together. All I could do was set one URI, and do GetResponse, or BeginGetResponse, which would fire off a request for just that one URI. I need it to pipeline multiple GETs over the same connection, to test whether our Web server properly responds to pipelined requests. Any pointers on how to do that, would be much appreciated Thanks cb Tag: best place to save application state? Tag: 93925
  - 11
    - Dynamic Event Binding & Interfaces (Complex Questions) Hello, I'm building up a new application framework that consists of multiple components that communicate through events. These components publish their events as they do work and consume events through what I'm calling the Event Service Controller (ESC). The purpose of the ESC is to receive events from the individual components and then publish events through multicast to each component that has subscribed to the events it is interested in. You might think of this as a traffic control system in that all communication goes to the ESC and then it is broadcast again. All of these components, and the ESC use a set of interfaces that define what events they publish. The problem that I'm running into is that when the ESC starts a component, how can it determine which interface(s) that component is using to publish events? I have many different components that (obviously) do not need to know anything about other components and I want all communication (through events) to go through the ESC to facilitate an elegant design. For example, I might later code a component to log specific events received by the ESC, regardless of where they came from and whatnot. The crux of the problem is that a specific component may raise only a few events defined in its interface, of which the ESC has a reference to, but the ESC has no way of knowing at runtime which interface(s) that component is going to use and therefore I cannot figure out a way to bind the event handlers in the ESC to the component. Ideas? I appreciate any help you can provide... I know that I can use reflection to get the publically exposed events from the components but that still leaves me trying to figure out the logic to bind those events to the corresponding handlers in the ESC. Thanks in advance! Chris Tag: best place to save application state? Tag: 93923
  - 12
    - Doing "&&" in codeDOM I have figured out how to do a CodeConditionStatement (if) in CodeDOM, but I am having trouble figuring out how to make it generate something like this... if ((a == b) && (c == d)) { //stuff } Any suggestions? Tag: best place to save application state? Tag: 93922
  - 13
    - Missing Method Exception (REALLY Weird!!!) PLEASE HELP I created a scripting engine that accepts source code, source language, and various other properties that specify imports, references, and such. Then, I created a ScriptPanel that allows editing of all this data, with a drop down for the language, list boxes for the imports and references, and a highlighting textbox for the script itself. Next, I inherit from the scripting engine to create custom scripts. These custom scripts contain properties such as RequiredMethodName, RequiredMethodParameters, and RequiredMethodReturnValue to clarify how they should be written, so that consumers of the custom script know what and how to call into the script. Likewise, the ScriptPanel contains these same properties such that the panel can be assigned the values from the custom scripts. In this way, the panel can test whether the requirements are met in the edited script. Seems logical, right? Well, the properties on the custom scripts and on the ScriptPanel are like so: Public Property RequiredMethodName() As String Public Property RequiredMethodParameters() As System.Type() Public Property RequiredMethodReturnValue() As System.Type Notice that the types of these properties are "System.Type" and an array of "System.Type". However, this is apparently not allowed, though I can find no documentation that says so. Whenever I compile, I get no errors. Even the background compiler does not give me any squigglies, and IntelliSense shows the correct property signatures. However, whenever I actually run the application, whether in debug mode or by launching the compiled EXE, I get the following error: System.MissingMethodException: Method not found: Void ScriptPanel.set_RequiredMethodParameters(System.Type[]) Well, that doesn't make any sense! The property is right there. How can it not be found? In the code editor, even when I right-click and select Goto Definition while on that property, it takes me right there to the code or to the Object Browser, depending on how I reference the project containing the ScriptPanel (I've tried it both ways). So, I thought, maybe it doesn't like properties of type System.Type or arrays of System.Type. (I also tried just with the single System.Type, commenting out the array, and I get the same error, albeit with a different method name.) So, I changed the properties to pairs of Set/Get functions like so: Public Function GetRequiredMethodParameters() As System.Type() Public Sub SetRequiredMethodParameters(ByVal parameters As System.Type()) Again, I get the following error: System.MissingMethodException: Method not found: Void ScriptPanel.SetRequiredMethodParameters(System.Type[]) WHAT??!! I just created that function. There it is right there! What gives? Can you just not pass System.Types around? That would be very strange if so, and no where can I find that this practice is not allowed. And if it is not allowed, I am totally screwed because I need to pass types around. Passing strings around might work, but then developers and script writers are going to have to fully qualify everything all the time. Not gonna happen. :) I have changed properties to functions, the names of the functions, putting the ScriptPanel in another namespace, the names of parameters, everything. The only thing that fixes this issue is removing System.Type and arrays of System.Type. Even when I look at the DLL with ILDASM, it shows the properties or functions as being there. Yet, at runtime, it cannot find them. Can someone please explain this to me? There seems to be something really wrong here and it is driving me bonkers. Tag: best place to save application state? Tag: 93920
  - 14
    - want fxcop and prefast in pro edition? are code quality tools 'enterprise' stuff or 'team development' tools only? i don't think so. read here: http://www.die.de/blog/PermaLink.aspx?guid=4d42ffe1-843e-4c8b-a2c9-ba825ce49f93 vote here: http://www.die.de/blog/ct.ashx?id=4d42ffe1-843e-4c8b-a2c9-ba825ce49f93&url=http%3a%2f%2flab.msdn.microsoft.com%2fproductfeedback%2fviewfeedback.aspx%3ffeedbackid%3d71c7a830-6d3c-4b0d-809a-cef527e7499a WM_FYI thomas woelfer http://www.die.de/blog Tag: best place to save application state? Tag: 93919
  - 15
    - fill DataSet using OleDbDataAdapter from Access field format is lost I have an Access database that has an input mask on a field, !\(999") "000\-0000;0;_ , that formats a phone number. When I fill a DataSet using an OldDbDataAdapter some of the records lose the formatting. For example: Sam Jones (999) 555-1212 *this is good* Joe Smith 9995551212 *this is bad* Why would some records lose the formatting? There is no rhyme or reason (that I can see anyway) why some records keep the formatting and some lose it. Thanks in advance for the help and plese let me know if you need any more detail. Tag: best place to save application state? Tag: 93914
  - 16
    - Split - not like perl? Hello, I am trying to use string.split to break up a string into fields. It seems as though, when using space as a delimiter, the method fails to perform as desired when more than one space delimits two fields. Am I interpreting this correctly? In perl, the following string: "this that and the other thing" would split into 6 elements. The .NET makes a fields for each space? Is there a way to handle this (other than regular expressions?) Tag: best place to save application state? Tag: 93912
  - 17
    - HttpWebRequest and Host header Hi... I've been working a bit with the HttpWebRequest class and one requirement I've gotten recently is the desire to set the HTTP Host: header separately from the specific machine referenced in the url. For example, the url http://frontend1.east.company.com but passing Host: www.company.com to emulate a call to the general front door. I look in the HttpWebRequest documentation on MSDN, and under the Headers property, it says specifically that the Host header's derived from the url (implying that it can't be overridden). Is there any way to do what I want to do? Thanks _mark Tag: best place to save application state? Tag: 93896
  - 18
    - stored procedure - ref cursor - no rows Hello, I am stumped. Hopefully another pair of eyes will see what mine cannot. I am calling a stored procedure that accepts a single output parameter [the proc has been dumbed down to limit variables of my problem] that is a ref cursor. When I make the call I get now data. I have used both adapter and datareaders. If I call the proc from another proc I can loop through the results. I am including the code of my c# function and the stored proc. The version number of my Oracle.DataAccess.dll is 10.1.0.303. ** Stored Proc *********************** TYPE refcursor is ref cursor ; procedure P_CUSTOMER_INFO_GET_SLIM( thecur out refcursor ) is begin open thecur for select * from customer_info where rownum < 21; end P_CUSTOMER_INFO_GET_SLIM; ** C# Func *************************** private DataSet _FetchCustomerData2(string CustNbr, string ShipToSuffix) { string sc = "PKG_CUSTOMER_CONTACT.P_CUSTOMER_INFO_GET_SLIM"; OracleConnection con = new OracleConnection(_Database.GetConnection().ConnectionString); OracleCommand cmd = new OracleCommand(sc, con); OracleDataAdapter da = new OracleDataAdapter(cmd); DataSet ds = new DataSet(); // must pass strings with data if (CustNbr.Length==0 || ShipToSuffix.Length==0) { return null; } try { // we are calling a stored proc so set it cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.Add("thecur", OracleDbType.RefCursor, DBNull.Value, ParameterDirection.Output); da.Fill(ds, "Customer"); // no data ????????????????? // Close and Dispose OracleConnection object con.Close(); con.Dispose(); return ds; ... Tag: best place to save application state? Tag: 93893
  - 19
    - how to do conditional compilation in VB.NET? Hi How can I do conditional compliation in VB.NET? Thanks Dee Tag: best place to save application state? Tag: 93892
  - 20
    - Collection Class Design Question (Compound Key) Hello, I have a class that inherits from the CollectionBase class that contains records from a table in database that has a compound key. Items Table Company_ID [PK, int] Item_ID [PK, int] Description [varchar(50)] Does anyone have any suggestions on how to implement a property, similar to Item(index as Integer), that accepts the compound keys? Desired Property Item(company_id As Integer, item_id as Integer) As CompanyItem Currently if the table has only a primary key, I create a hashtable to store the primary key and the index of the object. Private m_htKeys As Hashtable Default Public Property Item(ByVal key As String) As CompanyItem Get Return list.Item(m_htKeys.Item(key)) End Get Set(ByVal Value As CompanyItem) list.Item(m_htKeys.Item(key)) = Value End Set End Property I have tried storing the compound keys as a String Array in the hashtable, however when I try to find that String Arrary again it just returns the first object. Is there a better way of going about this? Am I crazy? Justin Tag: best place to save application state? Tag: 93891
  - 21
    - Open window on different screen Hi, I have created a windows service that can open applications such as Word, Excel and Acrobat. Since the service is opening the application, the view of the application is not available. Is it possible to have the application that is opened by this service user to show on a different screen, such as console or even better, a remote desktop session? The application is in .NET, specifically C#. VB.NET help would also be just fine. Thanks. Steve Tag: best place to save application state? Tag: 93890
  - 22
    - Trying to load a .NET dll I am experiencing the following problem. I have a c++.NET dll in some directory. Let's call it ABC.dll. Now, I try to create a c# project and add this dll to it. So I add it as a reference. The project builds. When I run it, however, I get a FileNotFound exception. File or assembly name ABC (mind you without the .dll), or one of its dependencies, was not found. Even more interesting, I have another app which uses this dll without any problems, though I am not running it right now. Tag: best place to save application state? Tag: 93888
  - 23
    - Re: Which NIC will framework application use? Hum...typical limited response. So...does anyone know how a C# app would select which NIC to use? For example, NOT USING SOCKETS, if one were to use a simple web service url, how could a specific NIC be selected? Amil "Norman Yuan" <NotReal@NotReal.not> wrote in message news:uA021OAMFHA.2748@TK2MSFTNGP09.phx.gbl... > Framework does not make the decision. It is the application (and ultimately, > the developer) that decides which NIC to use, should the app need to access > to network resources. The app itself may have to be configured to work in a > network environment, or it may use machine's Window's network settings. All > depends on how the app is designed. > > "Amil" <AmilHanish@hotmail.com> wrote in message > news:#CsSm3$LFHA.3336@TK2MSFTNGP09.phx.gbl... > > I have a computer with two NIC cards...on different subnets. When I fire > up > > a C# Framework application, how does it select which NIC to use for > network > > access? > > > > Amil > > > > > > Tag: best place to save application state? Tag: 93886
  - 24
    - Socket Class Slower Then HTTP Web Request I developed an application that automates dwonloading of a web page hundreds of times. I first developed it by using http web request, but then I read up that HTTP Web Request has some overhead that I thought I could eliminate if I re-wrote it with sockets. However, what I have found is that sockets actually works significantly slower (I get about 1/2 to 2/3 of the performance I get with HTTPWebRequest). Now, the web server sends a close command on every request so even if I post a Keep-Alive request I have to create and open a new socket for every request, but I assume the HTTPRequest class must do the same thing under the covers. Below is my Socket Send Method (very basic). Can anyone explain this strange disparity in performance? public string Send(string strRequest) { m_sock = new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp); m_sock.Connect(ipe); string strRetPage = null; Encoding ASCII = Encoding.ASCII; Byte[] ByteGet = ASCII.GetBytes(HttpRequest); Byte[] RecvBytes = new Byte[256]; m_sock.Send(ByteGet, ByteGet.Length, 0); Int32 bytes; do { bytes = m_sock.Receive(RecvBytes, RecvBytes.Length, 0); strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes); } while (bytes > 0); m_sock.Shutdown(SocketShutdown.Both); m_sock.Close(); return strRetPage; } Tag: best place to save application state? Tag: 93882
  - 25
    - Release Dates Can anyone point me in the direction of a list for the release dates for .Net including all betas, RCs, 1.0 & 1.1 I don't want 'sometime in Sept 2001' I need a definite list if there is one. Cheers Interviewer Tag: best place to save application state? Tag: 93876
- Next
  - 1
    - Windows Authentication question Hi. We are creating an intranet here in ASP.NET and we decided that we are going to use a kind of Forms Authentication but using the users in our windows domain. So, we are creating a default login form, but the user will use the name and password he uses to login to his computer. I would like to know 2 things: 1. How can I get a list of Windows users in my domain, so that I can list them for administration purposes. 2. After getting username and password from the user, how can I check it against my domain users to see if I should grant him access? thanks. Tag: best place to save application state? Tag: 93875
  - 2
    - Dispose problem with circular references Hi, I need to implement Dispose() for some objects that contain references to one another... fromObject -> (contains reference to) toObject ViewObject->TableObject->IndexObject ViewObject<-TableObject if i implement dispose for all of them and call dispose for fields that implement IDisposable - as FxCop rule says - i get stackoverflows... i read some papers, but each of them says diferrent things (?!)...even when sources are from MS...:))) another thing, in dispose do i set all reference objects to null? some says yes, some says no...what the heck is this?? so...how can i do this properly? Thank you very much, Daniel Tag: best place to save application state? Tag: 93872
  - 3
    - Setting a from alias when sending mail using Mail.MailMessage How can I add an alias when sending mail using Mail.MailMessage in VB.NET? I would like to do this: Dim msg As new Mail.MailMessage msg.From = MagSoft <magnus@company.com> msg.Send But this picks up my real name Magnus Österberg (stored in the SMTP server?) and shows that as sender when I view the e-mail in Outlook. Tag: best place to save application state? Tag: 93871
  - 4
    - Connecting to internet.. Hi all, this is a query more than a problem. I have a task in hand, whose scenario is as follows. i have a window application, using a button on which (say 'upload' or 'download') i need to connect to internet and then open my abcd.aspx page to process the text file passed.. The problem is not in sending or fetching the file or to process it, but the problem is the first step. If the client is not connected to the internet at the moment he presses the button, my application is suppossed to connect to the internet directly.. it means no processig window of the conecting application (say the one which is installed to connect to internet) should be opened.. how to even begin with this i am not clear.. pls help! thanks & regards Paras Tag: best place to save application state? Tag: 93870
  - 5
    - MessageFilters I want to create an application message filter that re- maps certain keystrokes. I need to be able to do this for=20 certain types of non-standard keyboards. For example, if=20 a user presses 'A', the underlying form should receive=20 a 'B'. My first idea was to use an IMessageFolter and=20 change the value of the WParam of the incoming message.=20 Since it is declared as a ref parameter, I was hoping=20 that it might work. Id does not. The code runs and the=20 value is changed, but the form still receives the=20 original message. It would be interesting to know why it doesn't work, but=20 even more I would like to know the correct way to do a=20 thing like this. regards G=F6ran Tag: best place to save application state? Tag: 93869
  - 6
    - This can't be true try running this C# code in VS.NET 2003: using System; namespace ExitCode { class MainClass { static int Main(string[] args) { return 7; } } } run it under the debugger, and what do you get? The program '[4552] ExitCode.exe' has exited with code 0 (0x0). see? zero, not seven. Is this a bug or what? Tag: best place to save application state? Tag: 93867
  - 7
    - Code Converter Some time ago, I came across an application that would convert one .NET language to another. What was unique about this converter was that it also worked with C++.NET. I long since misplaced it... Does anyone know what product this was, or know of another? Thanks all. -- ROT-13 my email address to reply directly Tag: best place to save application state? Tag: 93862
  - 8
    - BIFF8 Excel Reader Besides using Interop and ADO.NET, I;d like to know where can I get a BIFF 8 Excel reader in .NET which is free or GNU license? I'm not interested to get a third party which need to pay. I need a BIFF8 reader to read an excel file upload by a user. This BIFF8 reader need to to be perfect but can read all the values in a few worksheets. I don't wish to use interop and ado.net at the moment. I found a writer instead @ www.freevbcode.com/ShowCode.Asp?ID=6856 although this writer is in VB6 format. Tag: best place to save application state? Tag: 93856
  - 9
    - Data Form Wizard: value cannot be null, parameter name: type PROBLEM: I saw previous posts on the issue where you try to use the Data Form Wizard and you get the error: Data Form Wizard: value cannot be null, parameter name: type I also saw various solutions. None of which worked for me. I am using Version 2003 of Visual Studio .NET. SOLUTION: You can't name your Dataset the same as your table name that will be in the dataset or you will get this error. For example, I called my dataset "Agent" and my database table name was also "Agent". This choked. When I changed the dataset name to Agent01 and selected Agent table, it worked correctly. FYI. Tag: best place to save application state? Tag: 93855
  - 10
    - Cross AppDomain Communication, Scripting Howdy All, I am having difficulty with two-way communication across AppDomains in an attempt to dynamically script applications. Everything works as expected, except when using ByRef parameters. The below explanation is lengthy, but well worth the read. If you can help me, I'd gladly share this code which has greatly helped my development of extensible applications. I have developed an easy to use scripting engine for .NET that handles loading and unloading of a secondary AppDomain automatically. I call the object "SafeScriptingEngine", and it has properties for the source language, source code, and any needed references and imports. When its compile method is called, the code is compiled by the appropriate compiler, then it creates a new AppDomain, loads the compiled code into the AppDomain, and uses a Class Factory approach to return a well-known interface. This simple interface contains two functions called "MethodExists", which accepts a function name and a list of parameters then return a Boolean of whether the function exists, and "CallMethod", which again accepts a function name and a list of parameters then actually calls the function. Public Interface IRemoteLoader Function Invoke(ByVal methodName As String, ByVal parameters() As Object) As Object Function MethodExists(ByVal methodName As String, ByVal parameters() As Object) As Boolean End Interface So, an example of using this engine looks like: Dim sse As New SafeScriptingEngine() sse.Language = Languages.VisualBasic sse.SourceCode = "" & _ "Public Function UpperString(ByVal s As String) As String" & _ " Return s.ToUpper" & _ "End Function" If sse.Compile() Then If sse.MethodExists("UpperString", New Object() { "" }) Then MsgBox(sse.CallMethod("UpperString", New Object() { "this string will be converted to uppercase" })) End If End If All of this works great. There are no memory leaks, and all compilers, AppDomains, and assemblies are unloaded as desired and expected. In fact, I designed the engine to be inheritable such that functions can be created that are strongly typed. As you can see, the default engine expects a non-strongly-typed array of Objects. To prove the usability of the engine, I created a "SimpleStringScript" which inherits from the "SafeScriptEngine". The "SimpleStringScript" accepts only the part of code that does the manipulation, such as "s.ToUpper" in the example above. In the background, it adds function, parameters, and Return statement. Also, with the "SimpleStringScript", there is no need for "MethodExists" that accepts parameters. Instead, it has a "StringMethodExists" function that accepts no parameters, which then calls "MethodExists" on the base "SimpleStringScript" with a String Object as the parameter. Likewise, there is no need to call "CallMethod" with a function name and Object array. Instead, it has a "CallStringMethod" function that take a String as a parameter, which in turn calls the base "CallMethod" with the appropriate function name and the String parameter encased in an Object array. Public Class SimpleStringScript Inherits SafeScriptingEngine Public Function CallStringScript(ByVal s As String) As String Public Function StringMethodExists() As Boolean ... End Class Again, all of this works great, just as desired and expected. The problem arises when you create a script that uses ByRef parameters. I would like a function that looks like: Public Sub MyCustomFunction(ByRef e as MyEventArgs) e.MyObject.MyProperty = "some value" End Sub I quickly discovered that any parameter being passed into another AppDomain must be Serializable, as do any objects that are referenced in its hierarchy. Otherwise, it will throw a SerializationException when you try to pass in the parameter. So, I changed all objects that are referenced in the EventArgs to be Serializable, and that solved the problem when calling. However, upon return to the calling AppDomain, the objects and values in "e" are still the same as before the call. None of the manipulations taking place in the script from the secondary AppDomain are carried back to the calling AppDomain. I figure this is because, as expected with the Serializable objects, the "e" is being serialized, sent across the AppDomain boundary, then deserialized. When it is deserialized, an entirely new object is created. Changes made are not sent back across the boundary simply by using ByRef arguments. Unfortunately, I'm not sure exactly how to solve this problem. I think I should be sending an Interface as my argument, rather than an object of MyEventArgs. As long as the Interface is well-known in both AppDomains, I think the scripting AppDomain should know what to call, and when it does, the call should be marshaled back to the primary AppDomain via the Interface. Basically, the Interface is just a pointer back to the actual object. Can anyone confirm this to be True or False? If False, please HELP! If True, then is it possible to simply wrap the MyEventArgs object into an Interface, such as "IMyEventArgs", then change the scripted function to accept the Interface rather than the object, then pass an Interface rather than an object into the method? Would that suffice, so long as both AppDomains are aware of the Interface and anything it references? Obviously, if the Interface referenced a type that is not loaded in the secondary AppDomain, then there would be problems because the script would not know how to use it. Or, do I have to wrap the EventArgs into an Interface, as well as wrap every object that it references into an Interface. Meaning, again using the example above, would I also need to create an "IMyObject" Interface? My workaround for the time being is to return the object being manipulated as the return value, that way, the new object (created from deserialization) is again serialized upon return. However, this requires the scripter to know that they need to return it. Using C#, that is no big deal because the compiler will tell you when there is nothing returned. However, in Visual Basic, if you fail to supply a return value, you simply get Nothing. But, since I will be writing the scripts, I'll deal with the workaround for now. But, I sure would like ByRef to work across AppDomains. Any suggestions? Thanks in advance, Matthew ___________________________________ Matthew Roberts Framework Architect Business Process Solutions SOURCECORP Dallas, TX 75204 matthewroberts (at) srcp (dot) com Tag: best place to save application state? Tag: 93854
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    - Which NIC will framework application use? I have a computer with two NIC cards...on different subnets. When I fire up a C# Framework application, how does it select which NIC to use for network access? Amil Tag: best place to save application state? Tag: 93852
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    - i give up....parse string hello i want to parse/rplace/construct wahtever a string i get i read with directoryinfo out the root off my webapplikation Dim dirInfo As New DirectoryInfo(Server.MapPath("")) c:\inetpub\wwwroot\TEST i store this in a variable called physicalbasepath i list all folders in a datagrid and adds a buttoncollmn that executes using this which steps me one level into the filesystem Dim dirinfo As New DirectoryInfo(Server.MapPath(e.Item.Cells(1).Text)) ' where cell1 contains the full path of that dir i wanna go in to i store this in a variable called subphysicalbasepath i now have c:\inetpub\wwwroot\TEST and c:\inetpub\wwwroot\TEST\subfolder1 ' here we can get deep in so we must keep all from TEST\.....\and down i wanna turn this into http://server.domain.com/test/subfolder1 - this must be dynamic so i can use on any server and the folders can have any name i gets the urlpath using this Dim basepath As String = Request.Url.GetLeftPart(UriPartial.Authority) + ResolveUrl(Request.ApplicationPath) which gives me http://server.domain.com/test my though was to replace c:\inetpub\wwwroot\TEST\subfolder1 with basepath so it looks like this http://server.domain.com/test\subfolder1 then i can easy switch the \ to a / i can only accomplish this if i use this - replacing char with string Dim virtualpath1 As String = dirinfo.FullName.Replace("c:\inetpub\wwwroot\TEST", basepath) this gives http://server.domain.com/test/\subfolder1 which is what i want but not dynamic enough It wont work use this replace string to string Dim virtualpath1 As String = dirinfo.FullName.Replace(subphysicalbasepath,basepath) this gives c:\inetpub\wwwroot\TEST\subfolder1 Tag: best place to save application state? Tag: 93848
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    - httpwebrequest when RSA/ACE securid server is involved Hello, I have an assembly, written in C#. The assembly runs under IE (6.0 SP1). IE accesses a web site on which a reverse proxy with an RSA/ACE secureid is installed. When this happens an authentication process takes place and after its completion, the web request goes through and completes successfuly. Naturally, any further http requests to the same site will not have to re-authenticat. However, my C# assembly runs under IE and tries to invoke an http request via the standard httpwebrequest class. I am setting HttpWebRequest.Credentials = CredentialCache.DefaultCredentials still, it does not help. Any idea what I am missing here? Thanks, Ilan Tag: best place to save application state? Tag: 93841
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    - Problems installing Framework 1.1 of WinXPsp2 Just bought new notebook with Windows XP pro sp2. Trying to install ACT!, which requires .net framework 1.1. But I get the follow message during the installation of .net: application has generated an exception that could not be handled process id=0xc48(3144) thread=0xc9c(3228). The installation is then halted. Do I need to install Framework 2.0 beta?, or is is a matter of firewall settings, etc.? Thanks Tag: best place to save application state? Tag: 93839
  - 15
    - corrupted net 1.1 framework install I have a corrupted framework install. I can not uninstall or reinstall. I tried to reinstall following the kb article but I get the same error. The install is looking for a temp file tmp4B.tmp and can't find it. Any ideas? Thanks Fr. Robert Tag: best place to save application state? Tag: 93837
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    - Combobox text not in list strange behaviour Here is a weird one. I have a combobox that accepts and displays values that are not in the list. However if I do a droppedDown = true in the onEnter event handler and then tab to another combobox, the text value is reset to null/empty string. My solution at this point is to separate the two comboboxes with a textbox so that doesn't happen. (Note that it also resets to null if i step through through the droppeddown = true statement.) If anyone has seen this or heard of fix for it, please let me know. Thanks, Carl Here are code snippets pertainent to this: ' 'cboPaymentType ' Me.cboPaymentType.Enabled = False Me.cboPaymentType.Location = New System.Drawing.Point(152, 160) Me.cboPaymentType.Name = "cboPaymentType" Me.cboPaymentType.Size = New System.Drawing.Size(104, 21) Me.cboPaymentType.TabIndex = 2 ' 'cboPaymentMethod ' Me.cboPaymentMethod.Enabled = False Me.cboPaymentMethod.Location = New System.Drawing.Point(320, 160) Me.cboPaymentMethod.Name = "cboPaymentMethod" Me.cboPaymentMethod.Size = New System.Drawing.Size(104, 21) Me.cboPaymentMethod.TabIndex = 4 'payment type Me.cboPaymentType.DataBindings.Add("SelectedValue", Me.OrderDS, "Orders.OrdersOrderPayments.PaymentTypeFK") ' binding to the Text property appears to allow a value not in the list to be entered, saved, and displayed. Me.cboPaymentType.DataBindings.Add("Text", Me.OrderDS, "Orders.OrdersOrderPayments.PaymentTypeFK") Me.cboPaymentType.DataSource = Me.PaymentTypeDS Me.cboPaymentType.DisplayMember = "PaymentType.PaymentTypeName" Me.cboPaymentType.ValueMember = "PaymentType.PaymentTypeName" ' do it twice to get around bug Me.cboPaymentType.SelectedIndex = -1 Me.cboPaymentType.SelectedIndex = -1 'payment method Me.cboPaymentMethod.DataBindings.Add("SelectedValue", Me.OrderDS, "Orders.OrdersOrderPayments.PaymentMethodFK") ' binding to the Text property appears to allow a value not in the list to be entered, saved, and displayed. Me.cboPaymentMethod.DataBindings.Add("Text", Me.OrderDS, "Orders.OrdersOrderPayments.PaymentMethodFK") Me.cboPaymentMethod.DataSource = Me.PaymentMethodDS Me.cboPaymentMethod.DisplayMember = "PaymentMethod.PaymentMethodName" Me.cboPaymentMethod.ValueMember = "PaymentMethod.PaymentMethodName" ' do it twice to get around bug Me.cboPaymentMethod.SelectedIndex = -1 Me.cboPaymentMethod.SelectedIndex = -1 Private Sub cboPaymentMethod_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles cboPaymentMethod.Enter CType(sender, ComboBox).DroppedDown = True End Sub Private Sub cboPaymentType_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles cboPaymentType.Enter CType(sender, ComboBox).DroppedDown = True End Sub Tag: best place to save application state? Tag: 93836
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    - HttpWebRequest ->HttpWebResponse question Hi... I ran into an odd circumstance using HttpWebRequest. Specifically, when you call GetResponse() it throws a WebException, to quote the msdn page, Abort was previously called. -or- The time-out period for the request expired. -or- An error occurred while processing the request. The last item is the part I find quizzical. "An error occurred while processing the request" appears to cover any non-200 return status while ignoring that, say, a 404 or a 500 status *can* have a payload that is of interest. A custom error page, or a 500-page might have information about what went wrong. Is there any way to get ahold of the payload when the return status is not 200? GetResponse errors out, and I can't find a property to stop that. Thanks -Mark Tag: best place to save application state? Tag: 93835
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    - DirectorySearcher.FindOne() fails when LDAP path contains "/" Hello, I have a method that is used to find all of the distribution lists and security groups that a user belongs to. This works fine, except when the LDAP path looks like the following: CN=aaa/ aaaaa,OU=Distribution Lists,DC=string,DC=string,DC=string,DC=com I've found that everytime the DirecotrySearcher.FindOne() encounters a path that contains a '/' in the CN portion, it throws an exception. Below is the exception: Source: System.DirectoryServices Message: Unknown error (0x80005000) Stack Trace: at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail) at System.DirectoryServices.DirectoryEntry.Bind() at System.DirectoryServices.DirectoryEntry.get_AdsObject() at System.DirectoryServices.DirectorySearcher.FindAll(Boolean findMoreThanOne) at System.DirectoryServices.DirectorySearcher.FindOne() at ADUtilityTester.ADUtilities.getDLList(String sDomain, String sUser) in c:\\documents and settings\\username\\my documents\\visual studio projects\\adutilitytester\\adutilities.cs:line 74 Line 74 is: SearchResult schRes = ds2.FindOne(); I've tried escaping it, but then it just doesn't find anything. Any ideas on how to get around this problem? -- Michael Bayha Tag: best place to save application state? Tag: 93834
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    - Setting Printer Hi, can anyone pleasse tell me how to set the lpi on a doe matrix printer via code. VB.Net preferablly. It could be thdough windows API, it doesn't matter. Thanks Tag: best place to save application state? Tag: 93826
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    - windows service Hi, I have created a Windows service. In the project there is one service and one installer. I have also created a Setup project. When I run my msi file the service will not be installet into the Computer Manager/Service... the application are installed into the Porgram Files/MyApp folder. How can I trouble shoot this? Thanks Julia Tag: best place to save application state? Tag: 93824
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    - Word wrapping in Graphics.DrawString breaks words at umlauts Hi, I use Graphics.DrawString(string, Font, Brush, Rectangle, StringFormat) to render a string inside a rectangle with word wrapping. It works fine so far, but: If words contain german umlauts (ä, ö, ü etc.), lines are broken before or after these characters. The umlauts seem to be considered as delimiter characters. I can't find a language setting in the Graphics class or in the StringFormat class either. I tried to set stringFormat.SetDigitSubstitution(System.Globalization.CultureInfo.InstalledUICulture.LCID,StringDigitSubstitute.Traditional); but to no effect. TIA Franz Tag: best place to save application state? Tag: 93821
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    - Line numbers of methods in dynamically generated assemblies Hello, I am dynamically compiling .cs files to In-Memory assemblies at runtime using CodeDom. This works fine. The resulting assembly is parsed via reflection to detect the implemented class and the the methods of that class. This works fine, too. Now, I want to match the detected methods to the responding lines of code of the original source file. This is the problem! Maybee I have overseen something, but after a hard day trying to understand and use the System.Diagnostics.SymbolStore namespace, I am completely stuck. The methods of the SymbolStore seem to be only partially implemented and they are quite poorly documented. Does anyone have an idea how to get the line numbers of the first and the last line of a method, from which I have the MethodInfo? Any idea is greatly appreciated! Thanks in advance Uli Tag: best place to save application state? Tag: 93820
  - 23
    - Cost of using functions [vb.net] I was wondering if the use of functions decreases performance over placing all code after each other. For example: Instead of having function write anything to the screen using Response.Write(strMessage), I usually call a function DisplayMessage (strMessage), but now I'm wondering if this has any impact on the performance, or does the Framework recode (or how it is called) this to effecient code anyway. The main advantage is that, if I decide that those functions should not write anything to screen, I just have to disable that in only one place. Plus readability is increased :) Merely curious, as it is not really a performance issue, I'm wondering what the groups thoughts are about this. -- Message posted via http://www.dotnetmonster.com Tag: best place to save application state? Tag: 93817
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    - List of users for a folder How to retrieve a list of groups and/or users that have access permission to a folder? Thank you. Tag: best place to save application state? Tag: 93815
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    - BIFF8 Excel Reader Besides using Interop and ADO.NET, I;d like to know where can I get a BIFF 8 Excel reader in .NET which is free or GNU license? I need a BIFF8 reader to read an excel file upload by a user. I don't wish to use interop and ado.net at the moment. I found a writer instead @ www.freevbcode.com/ShowCode.Asp?ID=6856 although this writer is in VB6 format. Tag: best place to save application state? Tag: 93814

Hi
I tried to save my application's control data into App.config just to find
out
that it's has a read-only collection. So this is not like good old ini
files.
Are we still supposed to use the registry for this?
Thanks in advance.
Dee

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Re: best place to save application state? by Matt

Matt
Fri Mar 25 17:59:14 CST 2005

Hello Dee,

The registry is one choice for user specific configuration information. Another
is Environment.SpecialFolders.ApplicationData, which is a special folder
that you can drop files into. These files can be in any format you wish (ie:
ini or xml).

--
Matt Berther
http://www.mattberther.com

> Hi
> I tried to save my application's control data into App.config just to
> find
> out
> that it's has a read-only collection. So this is not like good old ini
> files.
> Are we still supposed to use the registry for this?
> Thanks in advance.
> Dee

Top

Re: best place to save application state? by Dee

Dee
Fri Mar 25 20:20:01 CST 2005

Thanks Matt

"Matt Berther" <mberther@hotmail.com> wrote in message
news:221a09c78d1e608c6ff731b9b42b7@news.microsoft.com...
> Hello Dee,
>
> The registry is one choice for user specific configuration information.
Another
> is Environment.SpecialFolders.ApplicationData, which is a special folder
> that you can drop files into. These files can be in any format you wish
(ie:
> ini or xml).
>
> --
> Matt Berther
> http://www.mattberther.com
>
> > Hi
> > I tried to save my application's control data into App.config just to
> > find
> > out
> > that it's has a read-only collection. So this is not like good old ini
> > files.
> > Are we still supposed to use the registry for this?
> > Thanks in advance.
> > Dee
>
>
>

Top