EndInvoke can only be called once for each asynchronous operation.

TheMSsForum.com: The Microsoft Software Forum

The MSS Forum ‹ Framework
- Archive
  - Biz
  - MCSE
  - CRM
  - Drivers
  - Framework
  - ADO
  - ASP
  - Compact
  - Forms
  - Dotnet
  - C#
  - VB
  - FontpageGen
  - Excel
  - WorkSheet
  - Exchange
  - Setup
  - Fox
  - Fontpage
  - ASP
  - IIS
  - Entourage
  - Money
  - Messanger
  - PocketPC
  - Powerpoint
  - Project
  - Publisher
  - Excel
  - VB
  - Security
  - Portal
  - Services
  - SQLServerDev
  - SVCS
  - SQLServer
  - VB
  - VC
  - MFC
  - ExcelGen

- Previous
  - 1
    - EndInvoke can only be called once for each asynchronous operation. Hi Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75560
  - 2
    - scheduling hi I'm planing to make scheduling app and need your advice on the best way to do that,and how to save the tasks to be executed and retrive their data at the right time. your input will be highly appreciated Majed Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75559
  - 3
    - Who can tell me how to monitor printer by C# Which class shall I use? Thanks! sunny Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75558
  - 4
    - .net zip equivalent of jar in Java Dear All, Is there a .net zip equivalent of jar in Java? I would like to compression my dlls while sending it across via No Touch...it should also take care of versioning... Thanks & Regards Jack Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75556
  - 5
    - LoadFrom and gzip Dear All, I have a stub program on my client...Can I use the gzip functionality along with No Touch? I am loading assemblies using assembly.LoadForm method...If I set the HTTPCompression to true in IIS...does it work with Assembly.LoadForm("http://localhost/Smart/bin/Startup.dll")...how do I test if http compression is working? Please help... TALIA Many Regards Jack Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75554
  - 6
    - Converting an XML documentation file to a help file Hi all, This may seem like an obvious question. How do I convert the XML documentation file that the C# compiler emits from my XML comments into a help file for the Microsoft Document Explorer? Is there a tool program or something that I am missing? I cannot find anything in any of the documentation. Regards, Chris Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75541
  - 7
    - Threading and raising events hello, I'm using C# and having a little thread communication problem : -one thread (and its associated object) receives UDP packets using the UdpClient class -another object (say Object2) needs to raise an event from another thread when a packet is received. -as Object2 *could* be sitting on the main thread, it cannot be blocked waiting on the "UdpThread" -Object2 is not a System.Window.Forms.Control -I'd rather avoid polling some synchronized variable. in the good old win32 times, i would have allocated a window handle in Object2's thread and used PostMessage from the UdpThread.=> no polling and no locking... Any advice on what should be done to remain in the .NET spirit while achieving such goals ? thanks in advance Sacha De Vos Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75538
  - 8
    - Responding to global keyboard shortcuts Hi! I have developed an app, which normally resides in the tray and does stuff in the background. I would like to make it possible to press a keyboard shortcut from anywhere in windows/applications and respond to that event. I have searched high and low on the web, but I guess I do not know excatly what to look for. :) Could someone please point me in the direction of an answer? :) - Klaus Jensen Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75537
  - 9
    - how to get the source file reference data from the clipboard in .Net Hello, I am familiar with obtaining source file reference material from the system clipboard using the old Win32 API. For example, copy an Excel chart onto the clipboard and goto Word. Under, Edit & PasteSpecial, there is a label called "Source:" which will contain the file path, etc. How can one obtain the source file reference material utilizing .Net technology? Thanks & Regards, TC Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75533
  - 10
    - HideEditBox in a DataGrid. Please Help. Hi All, Has anyone out there used HideEditBox, successfully? I am writing developing in VB .NET (VS .NET 2002) for the desktop. I have a datagrid which is ReadOnly. When you click in a cell, the text edit box appears which looks bad and distracts the user, AND it captures DoubleClick which I want to handle at the DataGrid level. I have set up a TableStyle and GridColumnStyles - all ReadOnly. I have created a new class for the columns, which inherits DataGridTextBoxColumn, and have called HideEditBox in the constructor. It does absolutely nothing. Here is the class: Public Class DataGridPassiveColumn Inherits DataGridTextBoxColumn Public Sub New() Me.HideEditBox() Me.Alignment = HorizontalAlignment.Right End Sub End Class ... I put the Alignment in there just to get some feedback so I know my class is working (I have to admit I'm new at this). The Alignment works, the HideEditBox does not. Can alybody help? I would appreciate it vey much. Randall Smallwood. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75530
  - 11
    - FILE I/O How do you delete some data from a file? The file size should shrink. How do you insert data at a specific offset without overwriting? Something like this: xy xaabcy 01 012345 -- Using Opera's revolutionary e-mail client: http://www.opera.com/m2/ Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75511
  - 12
    - Process.GetProcesses(remoteMachineName) Hi all, I want to get the list of active/running processes on some remote machines in the same LAN my application run. I always get a System.InvalidOperationExpection exception with the message of "Couldn't get process information from remote machine". I run my application under the administrator user account. Do you know where I am wrong? Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75510
  - 13
    - Client/Server I need to write an application (Server) that listen to a specific port, and receives and processes all requests that come from multiple machines (clients) at the same time. My question is; where can I start? Are there any examples that can help me? Thanks in advanc Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75507
  - 14
    - decimal.ToString behaviour I have come across a behaviour with the decimal.ToString method which i didn't expect, if i run the following console ap using System public class Ap public static void Main(string[] args decimal _decValue foreach(string _arg in args _decValue = decimal.Parse(_arg); Console.WriteLine(_decValue.ToString()) with the following arg 1 1.00 1.000 I will get output as follow 1 1.00 1.000 I would have expecte Can't see anything in the SDK explaining this. If anyone knows why this is so i would appreciate a pointer Thanks in advanc Pa Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75500
  - 15
    - TCPListener and Windows service Hi All I have a scenario The server can dial into the client for several task 1. To fetch several rows from 2 or 3 tables - I plan to zip the files and send it across the network; to increase performance, instead of row-by-row update on the serve 2. To execute a remote application on the client and fetch data returned by the client application to the serve 3. To transfer some files to the client which would be either stored on the client's hard disk, or execute an application and pass the file to the remote applicatio 4. To update sql data on the client databas My initial design was to make four TCPlistener exes listening to 4 ports and appropriately make the listeners to the appropriate jobs depending on the port that receives data Is it possible for me to have just one windows service to be running on the client, and depending on the parameter sent from the server, do one of the four options stated above Please advise Thanks Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75498
  - 16
    - Framework SDK version Can anyone tell me if the .NET Framework version 1.1 SDK will work with Visual Studio .NET 2002 (as opposed to 2003). Or at least tell me where I can find information on which versions of the SDK are compatible with which versions of Visual Studio. Thanks. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75494
  - 17
    - Urgent: how to call a web service through a thirdly authenticated web page?? hi all, We've been facing a difficult task that we need some wise advices from other professional indeed. Our client want before calling the webservice from 1 webserver, for instance A, we must go through an authenticated web page on webserver B which requires to input user name, password, then if valid, that webpage auto redirect to our web service. More in detail: we need call http://A/WebService/WebService.asmx it jumps to http://B/authentication/authentication, a HTML page here for inputting user name, password. Then if OK, it redirect to our webservice. We've checked by IE already. So, the problem is how can we fulfill this task??? Any help would be very appreciated. Khanh Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75491
  - 18
    - PerformanceCounter & PerformanceCounterCategory on Windows 2003 We are trying to create a custom performance counter and category in .Net 1.1 with Windows 2003 and XP as our operating systems. We use the following code to do this if (PerformanceCounterCategory.Exists(categoryName) PerformanceCounterCategory.Delete(categoryName) CounterCreationData ccd = new CounterCreationData(counterName, counterHelp, PerformanceCounterType.RateOfCountsPerSecond32) CounterCreationDataCollection ccdc = new CounterCreationDataCollection() ccdc.Add(ccd) PerformanceCounterCategory perfCategory = PerformanceCounterCategory.Create(categoryName, categoryHelp, ccdc) OurLibrary.Error.AssertThrow(perfCategory.CounterExists(counterName), String.Format("Expected \"{0}\" counter to exist.", counterName)) PerformanceCounter counter = new PerformanceCounter(categoryName, counterName, false) We get a "Category does not exist" InvalidOperationException when we assert that the counter exists. perfCategory != null at this time. The PerformanceCounterCategory.Create does NOT throw. We have tried many permutations of calls to try to get this to work, but it always throws. The odd thing is that the category and counter are actually created in the perfmon utility. We can see them from .net too, but not in the process that created them. We have tried this same code on Windows 2000 boxes and it works correctly. What is the problem with the Windows 2003 and XP operating systems that cause this to fail? We have searched the newsgroups and have not seen any explanations and very few instances of this problem. Are we the only ones using the .net performance counters Thanks Frank Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75487
  - 19
    - Good sockets tutorial needed Can anyone give me some links to tutorials on using sockets with .NET? Here's my scenario: I'm writing a service in .NET. I want to be able to create clients which can talk to the service to both get status information from it and also make configuration changes. I figure a simple TCP connection would be the easiest way to facilitate communication. I'm no sockets guru in the first place or I'd try to muddle through it on my own (which of course I may have to). Any pointers would be appreciated, and any suggestions on a better way to set up program-program communication across different machines would be welcomed. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75485
  - 20
    - HOWTO: Add help file to .Net IDE Gentlemen I've developed a library that a good number of programmers are using. I've also now created a Help file that explains this library Where could I find a white paper or article which would explain HOWTO add a third-party help such as mine so that it appears as a "Filtered by:" category within .Net Index, so that my programmers can reference this help right within .Net? Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75482
  - 21
    - IPC / Named pipes This is a multi-part message in MIME format. ------=_NextPart_000_0020_01C43F4C.452B0C50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable This is from the Stream help... Where is the IPC Pipe? I cannot find = anything on this. Using sockets is TERRIBLE for this sort of thing. We = have an app that keeps running out of socket handles because they are in = the TIME_WAIT. Why doesn't the framework recycle those? FreeBSD and = other Unix's will force recycle TIME_WAIT's when the system gets under = load and runs out. This seems like a really easy way for someone to DOS = attack a windows box. FROM THE HELP: Stream is the abstract base class of all streams. A stream is an = abstraction of a sequence of bytes, such as a file, an input/output = device, an inter-process communication pipe, or a TCP/IP socket. The = Stream class and its derived classes provide a generic view of these = different types of input and output, isolating the programmer from the = specific details of the operating system and the underlying devices. ------=_NextPart_000_0020_01C43F4C.452B0C50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV> <P><FONT face=3DArial size=3D2>This is from the Stream help...  = Where is the=20 IPC Pipe?  I cannot find anything on this.  Using sockets is = TERRIBLE=20 for this sort of thing.  We have an app that keeps running out of = socket=20 handles because they are in the TIME_WAIT.  Why doesn't the = framework=20 recycle those?  FreeBSD and other Unix's will force recycle = TIME_WAIT's=20 when the system gets under load and runs out.  This seems like a = really=20 easy way for someone to DOS attack a windows box.</FONT></P> <P><FONT face=3DArial size=3D2>FROM THE HELP:</FONT></P> <P><FONT face=3DArial size=3D2>Stream is the abstract base class of all = streams. A=20 stream is an abstraction of a sequence of bytes, such as a file, an = input/output=20 device, an <FONT size=3D4><STRONG>inter-process communication=20 pipe,</STRONG></FONT> or a TCP/IP socket. The Stream class and its = derived=20 classes provide a generic view of these different types of input and = output,=20 isolating the programmer from the specific details of the operating = system and=20 the underlying devices.</FONT></P></DIV></BODY></HTML> ------=_NextPart_000_0020_01C43F4C.452B0C50-- Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75478
  - 22
    - Runs Slow The First Time I have an application that uses data access that runs slow the first time. My first page reads data from an ODBC source and the second page hits a MSDE database. After each page opens the first time, they run just fine. What should I do? I have all my code in ASPX pages right now, but I would like to break it up in some code behind. Also, is this the advantage in pre-compiling data access classes (like in a dll or is there an easier way)? Help appreciated. Thanks. Steve *** Sent via Developersdex http://www.developersdex.com *** Don't just participate in USENET...get rewarded for it! Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75475
  - 23
    - passing values between web forms usign session variables any comments on this? I always use session variables to pass values among web forms. That is if I get a username, password in a Login form, then I pass these to the subsequent Search form as session variables. The search form needs to know who login to display the appropriate data.........is this the most efficient way of doing this? Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75474
  - 24
    - Mutex Differences VB.NET & C# Hi, I've got the following C# code that works perfectly to prevent a 2nd instance of my C# app: bool bAppNotRunning = false; Mutex MutApp = new Mutex(true, "MyC#AppMutex", out bAppNotRunning) if(bAppNotRunning == true) { Run the app and do work... MutApp.ReleaseMutex(); } I did the same thing in another app that's in VB. NET to prevent a 2nd instace of it: Dim bAppNotRunning As Boolean bAppNotRunning = False MutApp = New Mutex(True, "MyVBAppMutex", bAppNotRunning) If(bApNotRunning = True) Then Run the app and do work... MutApp.ReleaseMutex() End If Why doesn't the VB version work? bAppNotRunning comes back True from the Mutex constructor even when another instance of the app is already running?! What gives? Any ideas would be appreciated. TIA, -- John C. Bowman Software Engineer Thermo Electron Scientific Instruments Div. <Remove this before reply> john.bowman@thermo.com Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75466
  - 25
    - RSACryptoServiceProvider constructor very slow under Win XP I have a .NET app that uses the RSACryptoServiceProvider class to perform a key exchange with a server. During testing we've found that on some Windows XP machines, the call to the constructor for this class can take 15 or more seconds! On our Win 2K and Win 98 test machines it always takes less than 3 seconds. The problem's very easy to reproduce -- just create a console app with one line of code in it: RSACryptoServiceProvider p = new RSACryptoServiceProvider(); One most machines, this should run fairly quickly. On the afflicted machined, it's very slow. I know that the key generation goes on during the constructor, but 15 seconds...?!?! Also, as I said, this only affects SOME XP machines -- we have others that work just as the Win 2K boxes. To compare the XP machines that work fine to those that don't, we compared the advapi32.dll versions/dates, but they were identical. Has anyone else seen this issue or have any idea why XP would be so slow in generating running this constructor? Thanks for your help - Ken Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75465
- Next
  - 1
    - Class Modifiers via Reflection Is there a way to determine the access modifiers of a class type in an assembly via reflection? I see that I can determine if the class is public or non-public, but I would like to be able to further sub-divide the non-public modifiers (assembly, family, familyAndAssembly, familyOrAssembly, private). Is this possible with the .NET 1.1 Reflection API? And just to clarify, I see I can get this info for nested classes, but I would like it for non-nested classes too. Thanks for any suggestions or pointers on this. Kevin Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75464
  - 2
    - Config File for typefilterlevel change Can someone look at this post and tell me what can i do please.I have been waiting or 3 days now and still no answer. http://www.codeguru.com/forum/showthread.php?s=&postid=950198#post950198 Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75461
  - 3
    - Scan Resource Files Given a reference to an Assembly, is there any way to generically scan the assembly for embedded resource files ? And, given such a resource file, is there any way to loop through all the entries in that resource file without knowing what the keys are ? Any help gratefully appreciated. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75459
  - 4
    - EventLog Category I have an application that writes events to the Windows Event Log. I created a log Source ID on the Application log. Everything seems to be working fine except that all the events have the event category of Network. I found the code for that by trial and error. I would like to add two new event categories to make the event records more intuitive. I've spent a day already trying to do this. Can you tell me how to add two new event categories to my log records. For example if I have a log source ID of "Gizmo" on the Application log, I would like to log events with new event categories of Exception and Trace Data. Can you tell me how to do this? Thanks for your help. Best Regards, Paul J. Lay Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75456
  - 5
    - how to change the font Dear all, How to change the font in the table grid? Please go to the above link to see the problem http://destiny.xfiles.to/ubbthreads/files/562767-1.jpg THank you Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75455
  - 6
    - Non-modal Status Form Hi -- I'm trying to write a modeless status form that other classes can call and display information to the user while they're working. The problem is that the controls aren't showing up correctly in the status form when I call frm.Show(). They'll appear correctly if I use frm.ShowDialog(), but I don't want a modal form. I'm sure I'm missing something really basic here. What am I doing wrong? TIA. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75454
  - 7
    - Installation of Dotnet framework fails Hello All, I have same situation when I tried to install dotnet framework 1.1. The installation failed. My machine is a windows 2000 server , service pack 4 has been applied. The error message is: Error 1935.An error occured during the installation of assembly component {10BC3EDB-1888-4FD8-99E6-36851AB725oC}. HRESULT:-2147025891 Do any of of you encounter same problem? Any advice or help is vry much appreciated. Thank you Hai Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75452
  - 8
    - How to invoke a method using the thread which created the object Hello! In my program I've made an STA thread which is running separately from the main thread. The STA thread is instantiating some COM objects. Is it possible, from the main thread, to invoke the COM object using the thread which instantiated it? This situation compares quite much to the Invoke method of the Windows Forms Control class. Do some of you know how to achieve that? Best regards, Henrik Dahl Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75448
  - 9
    - DirectoryInfo / FileInfo I am writing a file manager that uses DirectoryInfo / FileInfo to obtain details about files and folders that are then shown in a ListView. During testing I have found that I can't delete some files or folders because 'another process is using them'. I ran Process Explorer (by Mark Russinovich www.sysinternals.com) and it shows that my app seems to have a massive number of files and folders open which is a bit worrying. Do DirectoryInfo / FileInfo actually open files? If so how do I close them? If not I'll need to look elsewhere in the app. -- Jeff Gaines - Damerham Hampshire UK Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75447
  - 10
    - Custom ToolBar & Code generation Hello, I'm coding a custom toolbar from scratch. The toolbar class uses a collection to store the buttons. Everything works fine except for this: I add my custom toolbar to a form, add some buttons and delete the toolbar: In my code, the toolbar buttons don't get removed! What went wrong? This is my code: [DesignTimeVisible(false)] public class coolToolBarButton : Component { private Image m_Image; [DefaultValue(null), System.ComponentModel.RefreshProperties(RefreshProperties.Repaint)] public Image Image { get { return m_Image; } set { m_Image = value; } } } public class coolToolBarButtonCollection : CollectionBase { public int Add(coolToolBarButton Button) { return List.Add(Button); } public void AddRange(coolToolBarButton[] Buttons) { for(int i=0;i<Buttons.Length;++i) List.Add(Buttons[i]); } public void Insert(int index,coolToolBarButton Button) { List.Insert(index, Button); } public void Remove(coolToolBarButton Button) { List.Remove(Button); } public bool Contains(coolToolBarButton Button) { return List.Contains(Button); } public int IndexOf(coolToolBarButton Button) { return List.IndexOf(Button); } public void CopyTo(coolToolBarButton[] array, int index) { List.CopyTo(array, index); } public coolToolBarButton this[int index] { get { return (coolToolBarButton)List[index]; } set { List[index] = value; } } } /// <summary> /// Summary description for coolToolBar /// </summary> public class coolToolBar : System.Windows.Forms.Control { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null; private coolToolBarButtonCollection m_ButtonCollection; [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] public coolToolBarButtonCollection Buttons { get { return m_ButtonCollection; } set { m_ButtonCollection = value; } } public coolToolBar() { // This call is required by the Windows.Forms Form Designer. InitializeComponent(); m_ButtonCollection=new coolToolBarButtonCollection(); SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.ResizeRedraw | ControlStyles.StandardDoubleClick | ControlStyles.UserMouse | ControlStyles.StandardClick | ControlStyles.SupportsTransparentBackColor, true); } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if( components != null ) components.Dispose(); } base.Dispose( disposing ); } #region Component Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { components = new System.ComponentModel.Container(); } #endregion protected override void OnPaint(PaintEventArgs pe) { // TODO: Add custom paint code here // Calling the base class OnPaint base.OnPaint(pe); } } Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75442
  - 11
    - StreamWriter Adds FFFE at the start of the file with Unicode Encoding!! Hi , all I'm trying to write unicode to a file for another app (not developed with vs2003) to read it. I used StreamWriter with unicode encoding.but I was surprised that the streamwriter adds FFFE to the start of the file,which stopes the other app from reading it!! any idea how to stope it frome doing that,do I have to use another class #####writer that supports unicode? help me Please! Thanks majed I did some code with diferent encoding and here is the result: UTF7 48656C6C6F2B4143454149512D0D0A Hello+ACEAIQ-.. DEFAULT 48656C6C6F21210D0A Hello!!.. ASCII 48656C6C6F21210D0A Hello!!.. BIGENDIANUNICODE FEFF00480065006C006C006F00210021000D000A ...H.e.l.l.o.!.!.... UNICODE FFFE480065006C006C006F00210021000D000A00 ..H.e.l.l.o.!.!..... UTF8 EFBBBF48656C6C6F21210D0A ...Hello!!.. and here is the code Imports System Imports System.Text Imports System.IO Class filestream Public Shared Sub main() Dim ASCIIStream As New StreamWriter("ASCIIStream.txt", False, System.Text.Encoding.ASCII) Dim BigEndianUnicodeStream As New StreamWriter("BigEndianUnicodeStream.txt", False, System.Text.Encoding.BigEndianUnicode) Dim UnicodeStream As New StreamWriter("UnicodeStream.txt", False, System.Text.Encoding.Unicode) Dim DefaultStream As New StreamWriter("DefaultStream.txt", False, System.Text.Encoding.Default) Dim UTF7Stream As New StreamWriter("UTF7Stream.txt", False, System.Text.Encoding.UTF7) Dim UTF8Stream As New StreamWriter("UTF8Stream.txt", False, System.Text.Encoding.UTF8) ASCIIStream.WriteLine("Hello!!") ASCIIStream.Close() ASCIIStream = Nothing BigEndianUnicodeStream.WriteLine("Hello!!") BigEndianUnicodeStream.Close() BigEndianUnicodeStream = Nothing UnicodeStream.WriteLine("Hello!!") UnicodeStream.Close() UnicodeStream = Nothing DefaultStream.WriteLine("Hello!!") DefaultStream.Close() DefaultStream = Nothing UTF7Stream.WriteLine("Hello!!") UTF7Stream.Close() UTF7Stream = Nothing UTF8Stream.WriteLine("Hello!!") UTF8Stream.Close() UTF8Stream = Nothing Console.WriteLine ("Done!) End Sub End Class Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75429
  - 12
    - Chicken and egg problem with FileIOPermission and Environment.GetFolderPath("My Documents") Hello, I am trying to assert a FileIOPermission to get access to the "My Documents" folder. To do this, I am using this code: FileIOPermission FilePathPerm = new FileIOPermission(FileIOPermissionAccess.AllAccess, Environment.GetFolderPath(Environment.SpecialFolder.Personal)); The problem I'm running into is that the code above throws a permissions acception. GetFolderPath method requires FileIOPermission to the path is is returning before it can return anything. So, it can't be used to return the path permissions are being requested for. So, how do I accomplish this task of requesting permissions for "My Documents" when I don't know ahead of time what the full path to "My Documents" is and I can't get access to it through the GetFolderPath method? Is there an environment variable or something that would hold this value? Thanks, Phred Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75426
  - 13
    - Macro Question Hello I am writing a macro in Visual Studio .Net 2003, and I was wondering if it is possible for a macro to access properties of objects that are selected. For instance, assume I have the following object declared (on a different page, but it can still be instanciated) Class rectangl Private _height as doubl Private _length as doubl Public Property height( Public Property width( End Clas Now, is there a way, using a macro, to take a name of an object type and then print the properties to the screen For instance - the object name 'rectangle' would print out 'rectangle Property: heigh Property: weigh I'm relatively new to this, and I suspect that if it could be done, it might be done using reflection, but I don't know how to approach it Can anyone provide help in this matter Thanks Andrew Wied Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75420
  - 14
    - Wi-Fi / Access Points Hello All, I have an application that will be connecting through an access point. At times there may be multiple networks available. Is there a way I can pragmatically force the application to drop one connection and connect to a different only depending on the SSID? Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75416
  - 15
    - Select a Specific Row in DataGrid at Form Load Time I have a DataGrid control in a Windows Form. At the time the form is displayed, I would like to have a specific row (record) being selected and highlighted. At form load time I can populate the data source of DataGrid control. At what time (handler of which event) should I go through the DataGrid control to locate the row and select specific record? Thanks. Jian Dai Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75415
  - 16
    - Security Policy, Code Groups and Security Tools. Could someone who has active experience of assigning Security Policys please clarify my follow comments... Having gone through the MSDN documentation on this subject, my condensed version of the way the security code permissions works is thus :- 1. An Assembly will be mapped to one or more Code Groups based upon the membership conditions specified within each code group. 2. When an assembly belongs to multiple code groups, permissions assigned by one code group can be overridden (increased) by permissions assigned by another code group when they are both part of the same Policy level. 3. Code groups from a lower policy level cannot override (increase) permissions set by an upper level (apart from when the permission hasnt yet been set) *but* can reduce them. 4. The user policy level code groups cannot grant additional permissions to an assembly *but* can only reduce them further. 5. When the Exclusive attribute is used on a code group, the code group will become the only one within that policy level to apply permissions, although the further policy levels code groups will be evaluated. When an application belongs to more than one Exclusive code group it will not be run. 6. When the Level Final attribute is used on a code group, no other policy levels code groups are evaluated *although* the current policy levels code groups will. 7. When Level Final and Exclusive are used together then the codegroup on that level will be the only one that will apply to the application through all policy levels. Couple of points. a. Firstly is there any reason that the code groups are / can be nested, from what I can see the answer is no -although I am assuming that it allows for a more specific targetting of conditions. b. Since the default Enterprise code group is All_Code -Full Trust and changing it could effectly cause problems with the framework, I assume this is left alone. Because this code group would override any additional code groups within this policy, I am assuming that all Enterprise level code groups should be marked as Exclusive. c. Does Caspol utility expose any additional functionality than mscorcfg utility (apart from the ability to do scripted config)? Thanks in advance -- Br, Mark Broadbent mcdba , mcse+i ============= Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75409
  - 17
    - Exception Handling and Loops Hi, I have a while loop where for each value I execute a database query. I have a situation where one of these queries abort due to bad data. I want the application to continue processing the loop for other values. I have tired what I thought would do this but it still aborts the application on error. I have a Manager class that has the while loop that calls a Data class that fromulates the parameters and the the right stored proc and that calls the MS. Data Access application block to execute the query The block of code in the manager class looks like this SqlDataReader drIDs = GetInformation(); while (drIDs.Read()) { int iId = drIDs.GetInt32(0); try { GenerateReport(iId); } catch (Exception e) { throw; continue; } } The error I get is .Net SQL Client Data Provider. Subquery returned more than one value. How do I skip the error and continue processing the loop for other values. TIA Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75406
  - 18
    - C Library Problem when using Managed Code The following line of code does not work when using the /clr option TCHAR *p = _tcsrchr(_T("Test\\String"), _T('\\')); if(p==NULL) AfxMessageBox(_T("Error")); If I disable the /clr option, the message box "Error" is not shown. My program is compiled to use the Unicode Charset and I have the macro UNICODE define. If I change the code to use multibyte charset it works fine. Does anyone know how to get this problem fixed? (CString ReverseFind has the same problem). Regards, Lourenço. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75401
  - 19
    - ERROR: COULD NOT FIND INSTALLABLE ISAM When using ADO.NET with ASP.NET, here is my code to bring in a table from EXCEL: Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;" _ & "Data Source=C:\Inetpub\wwwroot\ExcelData.xls;" _ & "Extended Properties=Excel 11.0;" When it tries to OPEN my connection, I receive the following error: COULD NOT FIND INSTALLABLE ISAM! PLEASE HELP! Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75399
  - 20
    - Connecting to existing remote project Hello, I have searched all over for the answer to this, to no avail. I have a web project already set up and running on a remote server, that I created from my home computer. I am now trying to connect to it from my work computer, but cannot figure out how to set up the project. Here are the various methods I've already tried: 1) When I try Open > Project From Web, I type in the URL, and then it prompts me for a project to open, locally. The problem is, I don't have a project set up locally -- that's what I'm trying to do. 2) When I try New > Project > Empty Web Project, I type in the URL (for Location), it tells me "There is already a project created on the Web" -- which makes sense. 3) When I try New > Project > New Project In Existing Folder, I give it a project name, then tell it the URL, then it tells me "Cannot create the project. There is already a project with the name '/myproject.vbproj' on the Web 'http://myproject.com'." 4) So, I tried copying the project files from the server to my local machine, and then tried opening the project, or pointing the prompt from method #1 (above) to the copied project file, but it then tells me "Unable to open Web project '/'. The file path '<path to project file>' does not correspond to the URL 'http://Localhost:'. The two need to map to the same server location. HTTP Error 404: Object Not Found". So I'm stumped. What the heck am I doing wrong, and why am I not finding any info on this? Please relieve me of my frustration -- I would be very much appreciative! Thanks in advance. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75397
  - 21
    - Enumerating a Distribution Group With > 1000 Members I have run into an issue in which I can not fully enumerate the members of a universal distribution group if the member ship is greater than a 1000 members. I can't find any blogs or help on this particular issue. Has anyone run into a similar issue and how was it solved. Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75396
  - 22
    - Controlling MDIChild forms Hi I kind of a new programmer. I started a few wees ago with Visual Basic .NET and I'm trying to develop a simple (I think) application with an MDIForm and an MDIChild. Thus, I open the Child form and it works fine but, when I close, using the close button (X) on the upper-right corner of its window, I canÂ´t mange to catch this event on the MDI Parent form, so I can redefine the MDI Form main menu again (show & hide some options) Can someone tell me a way so that the MDI Parent form knows when its child form has been closed (with the close button on the upper-right) Thank Paulo Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75394
  - 23
    - Loosing reference to Thread I need to have a thread run as long as it needs to, and not stop until it is cancelled by either closing the application or manually be stopped. It is simply pinging a machine to see what the connection speed is. The ping code is not the problem, as I have used it to get the speeds before, and it is solid What happens is that after the thread has been running awhile, it just stops. I cannot stop it, but when I restart the thread, it is fine. I don't mind restarting the thread, but I want it to do it automatically. Is there some code that I can put in to detect if the thread has gone awry? I have a button on the form that simply starts and stops the thread. If I leave the thread running too long, the code stops to work. When that happens, I stop the thread, and I get the 'Thread cannot be stopped' message box (see code below). Then I can restart the thread I used the code samples that the MSDN has to make it work. Here is the code I have now Public CancelThread As New System.Threading.ManualResetEvent(False Public ThreadisCanceled As New System.Threading.ManualResetEvent(False Private Sub SomeLongTask( ' Run code until CancelThread is set While Not CancelThread.WaitOne(0, False) ' Do some kind of task here System.Threading.Thread.Sleep(CSng(txtPingDelay.Text) * 1000) 'txtpingdelay = . ThreadPing( End Whil If CancelThread.WaitOne(0, False) The 'Acknowledge that the ManualResetEvent CancelThread is set ThreadisCanceled.Set( End I End Su Public Sub StartTask( ' Starts a new thread Dim th As New System.Threading.Thread(AddressOf SomeLongTask CancelThread.Reset( ThreadisCanceled.Reset( th.Start( End Su Public Sub CancelTask( ' Stops any threads started by the StartTask procedure ' Notice that this thread both receives and sends ' synchronization events to coordiante the threads. CancelThread.Set() ' Set CancelThread to ask the thread to stop If ThreadisCanceled.WaitOne(4000, False) The ' Wait up to 4 seconds for the thread to ' acknowledge that it has stopped Els MsgBox("The thread could not be stopped." End I End Su Private Sub ThreadPing( Dim Sum As Int32 = Dim myPinger As IDOTPing.Ping = New IDOTPing.Pin Dim ret As Int3 If txtHost.Text.Length < 1 The ret = myPinger.PingHost("localhost" Els ret = myPinger.PingHost(txtHost.Text End I PingAverage.Enqueue(ret If PingAverage.Count > PingCount Then PingAverage.Dequeue( Dim myEnum As IEnumerator = PingAverage.GetEnumerato While myEnum.MoveNex Sum = Sum + CLng(myEnum.Current Console.WriteLine(myEnum.Current End Whil lblResult.Text = "Connection Speed: " & ret.ToString & " MS Sum = Sum / PingAverage.Coun Label2.Text = "Average for last " & PingAverage.Count & " pings: " & Sum & " MS If Sum > pgPing.Maximum The pgPing.Value = pgPing.Maximu ElseIf Sum < 0 The pgPing.Value = Els pgPing.Value = pgPing.Maximum - Su End I End Su I hope someone can help me out. I have not had a lot of luck lately getting any help from this newsgroup. Kind of disappointing when you need the help Brad Simon Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75393
  - 24
    - EventLog Source I used the EventLog class to create an Event Source under the Application log. That was a snap. In order to register custom event categories, it appears that you need to know the guiid of the event source. Is that correct? If so what is an easy way to determine the guid of the event source? Please advise. Thanks for your help. Best Regards, Paul J. Lay Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75389
  - 25
    - Resource File Related Hi, I have .NET 2003 installed on windows 2003 server. I have a resource file named as myresource.resource. I wanted to convert it into a dll file. How can I do it? Thanks for the help in advance. -- Thanks & Regards, Atul Shukla Tag: EndInvoke can only be called once for each asynchronous operation. Tag: 75384

Dear Si

I had created two components one component calls another component Asynchronously

The Problem is when i call EndInvoke Function, It will throw a error message saying that
"EndInvoke can only be called once for each asynchronous operation"

Please help me out in this regard

Thanks Regards
Umesha Y.K

Top

Re: EndInvoke can only be called once for each asynchronous operation. by Jon

Jon
Mon May 24 02:52:27 CDT 2004

EndInvoke can only be called once for ea <umeshayk@ecanarys.com> wrote:
> I had created two components one component calls another component
> Asynchronously.
>
> The Problem is when i call EndInvoke Function, It will throw a error
> message saying that "EndInvoke can only be called once for each
> asynchronous operation"
>
> Please help me out in this regard.

So, how many times *are* you calling EndInvoke?

Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Top