Need help in identifying a control

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  - 1
    - preventing the label from getting focus? hi , I have a groupbox with labels and textboxes , just like a regular form. I've set the tabindex for each consecutive textbox to tabindex of the prior textbox +1. The labels have high indexes , but they still recieve focus after every textbox Is there any way to prevent this? Thanks Gideon Tag: Need help in identifying a control Tag: 111715
  - 2
    - From Console::WriteLine() to message box /* I am trying to use message box instead of Console::WriteLine() to upgrade my code from just using the console to using GUI. In the bottom 2 lines, #1 works, but I have hard time to make # 2 works. Can anybody give a hand here to make the information to be shown on the message box instead of being shown on the console. I am using visual C++ .NET 2003 Thanks */ #include "stdafx.h" #include <gcroot.h> #using <mscorlib.dll> using namespace System; using namespace System::Runtime::InteropServices; typedef void* HWND; [DllImportAttribute("User32.dll", CharSet=CharSet::Auto)] extern "C" int MessageBox(HWND hw, String* text, String* caption, unsigned int type); __gc class MClass { public: int val; MClass(int n) //costructor { val = n; } }; class UClass { public : gcroot<MClass*> mc; UClass(MClass* pmc) //constructor { mc = pmc; } int getValue() //get function { return mc->val; } }; int _tmain() { Console::WriteLine(S"Testing..."); //Create a managed object and assign 3 to it MClass* pm = new MClass (3); //Create an unmanaged object and assign the value of the manged object (pm) to it UClass uc(pm); Console::WriteLine(S"Value is {0}", __box(uc.getValue())); //<-------- This will work # 1 //MessageBox(0, uc.getValue(), S"Message Box...", 0 ); //<------- this will not work # 2 return 0; } Tag: Need help in identifying a control Tag: 111711
  - 3
    - TabPage Control OnClick Event I am trying to run code that binds a DataGridView control on a TabPage. I inserted the code in the TabPage_Click event, but when the tab is clicked, the event never fires. I understand it is necessary to set the StandardClick style to enabled. I can't seem to find a StandardClick style on the TabControl, but I used the following code in the Form_Load event. this.SetStyle(ControlStyles.StandardClick, true); this.UpdateStyles(); Still no click event... Am I doing something wrong? -- Regards, Fred Chateau http://hotelmotelnow.com Tag: Need help in identifying a control Tag: 111709
  - 4
    - host WindowsForm control in MFC Hi: We have a problem when host a Windowform control in MFC. The logic we used just as Chris Sells article: http://msdn.microsoft.com/msdnmag/issues/03/03/WindowsForms/#S4 Everything went good. The control hosted in a MFC dialog. After open/close the dialog for couple of times, then we have following error: Managed Debugging Assistant 'ReportAvOnComRelease' has detected a problem in 'v:\Barracuda\Console\Bin\Barracuda.exe'. Additional Information: An exception was caught but handled while releasing a COM interface pointer through Marshal.Release or Marshal.ReleaseComObject or implicitly after the corresponding RuntimeCallableWrapper was garbage collected. This is the result of a user refcount error or other problem with a COM object's Release. Make sure refcounts are managed properly. The COM interface pointer's original vtable pointer was 0x78307604. While these types of exceptions are caught by the CLR, they can still lead to corruption and data loss so if possible the issue causing the exception should be addressed If it happens in the debug, you click the Continue button for couple of times, it can recovered from the exception. Anyone have idea what is going on? Thanks in advance. Tag: Need help in identifying a control Tag: 111708
  - 5
    - Displaying new controls and threads. I have a .NET UI threading question. I know the general rule that UI contents can't be changed from another thread. Here's my specific situation. I built a DLL that contains a unified GUI layout for several projects we're working on. The layout is basically a Form with a TableLayoutPanel (1 row, 2 columns), call it myMainTableLayoutPanel. Col0 contains a TreeView that we'll use to display different steps that application takes. The TreeNodes for the tree are provided by the individual groups when they use the DLL. Col1 contains essentially a blank panel where each product group will plug their own content. As far as this main DLL is concerned, accessing the TreeView (giving it the contents, changing color/checkboxes of the nodes) and displaying "something" in the blank panel on Col1, all follow the delegate threading model (use delegates and Invoke() methods). Now we come to the individual groups that are writing what essentially is a plugin for the DLL. lets say I write a plugin that will display calculation of Pi in the blank panel of Col1. To do that, I have created a PiCalculationPane (name it piCalculatorPane) that has some label used to print out how many digits of Pi have been calculated so far. Basically, I am talking about dynamically changing the contents of the pane that is displayed in blank panel. The application that displays the blank panel runs in its own thread. How far do I have to follow the UI threading model? If I want to update the Pi calculation in the piCalculatorPane, do I just call piCalculatorPane.Invoke(delegate fcn) and within fcn update the data, or do I have to chain the Invoke call down to myMainTableLayoutPanel? Sorry for a long and winded question, Thanks, Andrei Tag: Need help in identifying a control Tag: 111704
  - 6
    - Seeing the selected node after TreeView expansion Hi there, I have a treeview withmany nodes within it, at many levels. I have writen a function which collapses the list at a certain node level and another function for expanding the list out fully. The problem is that after I expand the list, the end (bottom section) of the expanded list comes into view, resulting in the fact that sometimes the selected node is not visable after expansion. I wish to adjust the view so that the selected items appears at the top of the treeview's view (window). How would you solve this? Barry. Tag: Need help in identifying a control Tag: 111701
  - 7
    - NumericUpDown.Select(Int32, Int32) does not work - Bug? (.Net 2.0) I want to select the Text in a derived NumericUpDown control when the user enters the control by overriding OnEnter() and within this method calling this.Select(0, this.Text.Length). However, the behavior is not as I expected - nothing happens. Further more, Visual Studio does not offer the Text Property in its AutoCompletion, even though the Text property exists in the NumericUpDown Class. Does anybody have any ideas why this strange behavior occurs with the NumericUpDown control? Regards Stephan Tag: Need help in identifying a control Tag: 111700
  - 8
    - -Ann- File Explorer components for Vista Hi The component suite for full-featured shell exploring has been released. Comprehensive support of Vista GUI (Views, Icons) specifics is added. News is at: http://www.pisyslabs.com/TrueFolderExplorer.aspx -- Thanks - Jerry Tag: Need help in identifying a control Tag: 111699
  - 9
    - Data Binding in depth Hello, I'm moving from asp.net to windows forms programming and I have some difficulties in learning data binding.. (DatabindingSource, TableAdapter, etc etc) Can someone tell me about some free tutorial on this argument? thanks M.A. Tag: Need help in identifying a control Tag: 111697
  - 10
    - XML overwitten by clickonce Hi, In the application Iâ??ve wrote, a netwerk folder is used,â?¦ this folder can be different for users working in another domain, company,â?¦â?¦ My question: once the user have selected the network folder, the data is written to a xml file, but the moment an application update is available, this xml file is overwritten with the original one. How can I solve this?? -- Best regards Luc N Tag: Need help in identifying a control Tag: 111696
  - 11
    - How does DataGridView get its tool tip text? Where does DataGridView get its ToolTip text? I've got a DataGridView in which I've placed a RichTextBox derived column. Most of the time, the tool tip gets its text from a call to DataGridView's CellFormatting method. Because the cell is RichText, I have to strip out the RTF formatting and so I have a function that does that and it is embedded in the CellFormatting method. However, there are times when the bubble help displayed appears to come from some place other than CellFormatting. The bubble help can sometimes display the raw RTF. So- what are the possible places that a DataGridView can go to get its tool tip text? -- Richard Lewis Haggard General: www.Haggard-And-Associates.com Please come visit here for a couple thousand good giggles!: www.haggard-and-associates.com/Humor/humor.htm Tag: Need help in identifying a control Tag: 111690
  - 12
    - Label Printing Application I need to convert a label printing application from Froxpro 9 to c# 2. The application is a simple sdi app with a small preview window of the label on it. I'm not sure where to even begin to do this with c#. Any ideas? Here is the screenshot of the current application written in Foxpro 9. http://deciacco.com/blog/wp-content/uploads/2006/12/lblprint1.gif Thanks. Tag: Need help in identifying a control Tag: 111687
  - 13
    - Form Level Keyboard Handling I'm having a little trouble creating a global keyboard handler with the functionality I need. I want the form to handle all the keystrokes, which works perfectly when the form's KeyPreview property is set to true. However, there are instances when if a certain control has focus, I want the keyboard handling to be controlled by that control. Is there any elegant way to do this? I thought about setting the form's KeyPreview event to false in the control's Enter event handler and true in it's Leave event handler, but that didn't seem elegant to me. Any help would be appreciated. Thanks. Sergio Tag: Need help in identifying a control Tag: 111678
  - 14
    - Call system application to open a specified file. Hi, In my program, client is allowed to select a image file from open file dialog. And I am required to provide a preview button, when clicking it, system program like paint should be called to open that file. May you tell me how to implement that. Thx zlf Tag: Need help in identifying a control Tag: 111677
  - 15
    - DateTimePicker.Value Hi, I have DateTimePicker control on a winform. When user selects a date in that control, I am getting proper value using DateTimePicker.Value. But I want to know in case user does not select any date and closes DateTimePicker control by pressing escape key. Here in this case also I am getting today's date even if user did not select any date in that control. I should get null or something else that will let me know that user did not select anything and closed the DateTimePicker by pressing escape key. Any idea how to do that? Thanks! Tag: Need help in identifying a control Tag: 111671
  - 16
    - sending message to parent form Hi all, I have a usercontrol I place on different parent forms. When I double click on something on the usercontrol I want to invoke a method on those parent forms. I also need to pass an object from the user control to the parent control when calling that method. how can I do this best? Thanks, Stijn Tag: Need help in identifying a control Tag: 111666
  - 17
    - Form proprties - Is it a bug or .. ? Hi, I have a simple winform with a background that work fine. When I set both the RrighTtoLeft to Yes and RightToLeftLayout form proprties to True, the form background disappear. How can I solve this ? Thank You. Tag: Need help in identifying a control Tag: 111664
  - 18
    - How to print a panel? Hi, I have many content panels in my application, client asks me to add a print button in those panels. Once clicked, the content of panels will be printed out. There is a control in .NET 2.0 could meet my requirement? Thx Tag: Need help in identifying a control Tag: 111661
  - 19
    - Backup database from code: Access denied on user specific directories I want to backup a sql express database from my windows forms C# code. I can do this by running a sql command "BACKUP DATABASE TO..." (or using SMO) and I can save the backup file to any subdirectories of C:. The problem I have is that I want the user to be able to save the backup file to any location, including C:\...documents and settingsm\my documents... However, the file access for these directories (user specific) are more limited and the BACKUP DATABASE command fails due to Access Denied. Should I mess with the ACL to grant NETWORK SERVICE read/write permissions on the directory they want to save to? I am not very comfortable doing this as I don't like the idea of changing the ACL security on someone's system. The simplest solution is for me to restrict where they can save the backup file (to subdirectory of C:\), but if there are any other solutions, I'd like to hear them. Thanks. Tag: Need help in identifying a control Tag: 111653
  - 20
    - using DateTimePicker with null entries Hi I have a windows form that includes a datetimepicker control. The form gets its data from a ASP Web service. The database field that supplies the data to the DTP control can have null entries. Unfortunately the DTP control either displays the correct date when there is data in the field but when there is no data (null), it displays todays date. Is there any way of geting the DTP control to display nothing when there is no entry? Hoping somebody can help. Kind regards Ross Petersen Tag: Need help in identifying a control Tag: 111652
  - 21
    - DateTimePicker I am using DateTimePicker control in my form and I wanted this control to be shown in open state (like user clicked it to open) when form loads. Any idea how to do that? Thanks! Tag: Need help in identifying a control Tag: 111649
  - 22
    - Problems with the Windows Forms Designer Hello all, I've been working on a project in VC++.NET 2005 which contains a form with a custom control. Today when I opened the project, the designer complained: Could not find type 'VIAWorkspace.Toolbar'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built. Now, I've rebuilt the solution. When it runs the toolbar appears as I expect it to, but the IDE refuses to correct the problem. How can I fix this? Evan Tag: Need help in identifying a control Tag: 111647
  - 23
    - "Save As" window is now full screen How can I restore the smaller size of the window, as it normally is, in the case where I have accidentally made the "save as" window full screen, to the point where I cannot even find the edges of the page or move it by pulling the blue bar at top? Tag: Need help in identifying a control Tag: 111646
  - 24
    - JOB ANN: IT / Programming - Dallas / Fort Worth, TX All - Please allow me to bump in here. You all have helped me in the past with my various questions / issues, so I thought I'd try to open this up to anyone interested. Thanks, Brian Systems Specialist to join expanding corporate aviation consulting firm headquartered in Grapevine, Texas with additional offices in NJ, CT, IN, KS and MD. We are a leader in the business aviation market with a staff of 25 and growing. Our financial modeling, in-house technicians and transactional expertise form the backbone of our services and partnerships with our clients. This take-charge candidate should have at least five years of experience in deploying and maintaining inter-office systems to include computers, communication systems, software and architecture, system testing, write/code/implement .NET applications. Strengths in Windows forms, Web programming and database, Windows servers, Windows clients are preferred. Knowledge and experience with SQL, Pivotal Software, Blackberries, and Mobile Phones. Some travel will be required to maintain and integrate office systems. Essential Duties and Responsibilities: . 25% - Perform systems administration of networked systems and remote users, technical support and maintenance of installed systems and application software. . 5% - Develop and maintain detailed technical knowledge of specifications, operation, and diagnostic of products while maintaining familiarity with competing products. . 40%- Design, build and implement applications and back-end databases using various programming and scripting languages. . 5% - Create technical and functional specifications for Internet and Web-based projects. . 5% - Determine new technologies to utilize based on company's needs. . 15% - Analyze existing workflow environments and assist with setting up and configuring new installations to fit into workflow models. . 15% - Conduct orientation to new users regarding applications of software. . Adapt to changes in the work environment, manage competing demands and deal with frequent change, delays or unexpected events. Our team is dynamic and energetic and we take pride in providing a great working atmosphere for our employees. We offer a competitive salary and benefit package to the right candidate. Please email your resume, contact details and salary requirements to jobs07@leas.com for consideration. Posted to: microsoft.public.dotnet.framework microsoft.public.dotnet.framework.windowsforms microsoft.public.windows.server.general microsoft.public.windows.server.networking Tag: Need help in identifying a control Tag: 111644
  - 25
    - Missing characters when reading from a file Hello, I have the following reader function : public static string[] fileReadAllLines(string strFileName) { ArrayList content = new ArrayList(); using (StreamReader sr = File.OpenText(strFileName)) { string input; while ((input = sr.ReadLine()) != null) { content.Add(input); } sr.Close(); } return toStringArray(content); } which also can be replaced with : public static string[] fileReadAllLines(string strFileName) { return File.ReadAllLines(strFileName); } Both those methods remove all special characters (é,è,ø,æ,...) from the stream, what to do to get them ? Thanks Tag: Need help in identifying a control Tag: 111641
- Next
  - 1
    - Cancelling Form.Load event I load some data from the database during the forms load event. If this load fails, then I need to bring up the error message and abort loading the form. How do I do this in .NET 2.0? There doesn't seem to be a way of cancelling the forms construction from within the load event. Also if an error occurs I don't want a blank form displayed under the error message that then vanishes after the user clicks OK. Any help much appreciated... -- Best regards Mark Tag: Need help in identifying a control Tag: 111640
  - 2
    - TreeNode editing and clipboard problem I have Cut/Copy/Paste in the menu, that works with my TreeNode derived objects and not with text. When someone enters the editing of the node text, TreeView process the Ctrl+C and puts the marked text into clipboard. I wish my functions do the same with menu Cut/Copy whenn the node is editing (it should do the same as shourcuts Ctrl+C). I can copy whole node text, but not only the marked text or the text that was just changed. How can i do this, especialy if the text is editted and only a pice is marked? Thanks Tag: Need help in identifying a control Tag: 111639
  - 3
    - Controls Hide/Show display performance Hi I have a quite complex GUI in C#, where i save space by using many Panels, Pictures which hosts controls. When the user needs a function, i hide the "olds" panel, pictures.. then show the necessary ones. All these visible=true/false are killing my app in terms of display performance and give vey bad impression. Can someone help me how to improve ? Thanks Jonathan Tag: Need help in identifying a control Tag: 111629
  - 4
    - Display html page in winform(.NET 2.0) Hi, I have some html codes, and I need to present the rendered html page to user in winform program. I cannot find a helpful control in .NET framework. How to do that in .NET 2.0? Thank you Tag: Need help in identifying a control Tag: 111626
  - 5
    - combobox with command items Hi I want to have a combobox with some commands in it and a data source. Basically the list should look like command1 command2 ----------- data1 data2 data3 To solve this problem i decided to derive my own combo box form standard ComboBox control. I exposed 2 properties in this class 1) List of CommandItems 2) ArrayList as data source Now i tried to merge these 2 sources as 1 source and set the data source for the base class. I also set the DrawMode to OwnerDrawVariable and subscribed to DrawItem event. I thought that i would be able to draw the items on my own. This way i am able to insert the separator between command items and the data items. However when i do this i am unable to set the DisplayMember of the combobox it doesn't work at all. Additionaly i also am thinking even if i am able to do that it has to be different for data list and the command list. Any ideas on how can i achieve this ? ~Abhishek Tag: Need help in identifying a control Tag: 111617
  - 6
    - Shown method for User control Hi, Is there any event like Shown for User Control? I am instantiating User control once and adding and removing to and from parent form panel dynamically. I wanted a event which would fire every time the User control is shown (when added to parent from panel) like Shown event is for Form. Thanks. Tag: Need help in identifying a control Tag: 111616
  - 7
    - Anchoring issue. Lets say I have a control at the bottom of my form and I have it set to anchor Top, Bottom, Left, Right That does exactly what I want it to do.... Ok here's my issue. I have recently taken the contents from that form and placed them on a user control instead. I set the output type to dll for the project with the user control. I implement my own interface, compile, and then place the dll in a plugins directory of my host app. My host app then rakes the directory, finds any types that implement the interface and when it finds one it loads that user control as a new tab in the host apps tab control. The interface requires that there be an init function. The host always runs this when it finds the dll and passes in DB information. Inside the init function I have tried to also set the user controls anchor like so: this.Anchor = ((System.Windows.Forms.AnchorStyles) ((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) | System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right))); I'm not sure if the syntax is 100% in this posting because I've commented and uncommented and recommented so many times trying different combinations. Just know that I'm setting it the same as if I were using the designer. Top, Bottom, Left, Right... Now the Host app has a tab control as I've already stated. It has it's anchor set to Top, Bottom, Left, Right so that it expands if the form does. Now when it loads, everything runs off the screen. So let me lay out the context more clearly: Host Form - Tab control - Anchor Top, Bottom, Left, Right - User Control found at runtime - Anchor Top, Bottom, Left, Right - Control - anchro Top, Bottom, Left, Right I can create the same app with just a tab control and place the end control right on a new tab page and anchor it. That works as expected and everything expands as it should. but once I put the control on a user control and then load that dynamically into the tab control setting it's anchor, everything expands way off to the right and bottom. Any help would be great!!!!!!!!!!!!!!!!!!!!!! Tag: Need help in identifying a control Tag: 111615
  - 8
    - need help on regex hi, i'm a newbie to regex.... i need to check if a given string has more than two occurences of . in the begiining of string for ex, if string has value .test is valid but ..test is invalid Can you help me out with the pattern for such strings? Tag: Need help in identifying a control Tag: 111611
  - 9
    - Check these dotnet links Hi There are lot of sites providing good content on dot net.. here are a few links I visited recently and found good.. http://maximumcoding.blogspot.com/ http://dotnetinterviews.blogspot.com/ http://www.xcessdotnet.com/ http://techinterviewquestion.blogspot.com/ http://dotnetforum.blogspot.com/ Enjoy :) Ayesha Tag: Need help in identifying a control Tag: 111607
  - 10
    - How can I use C++ codes with .NET Framework codes? I would be pleased if someone gives me a general idea; how I am going to do this. I am using visual C++ .NET 2003. I made a simple program using conventional C++ code. This program accepts data from the user, does some calculations and outputs the result back to the user using the console. Now, I want to use the .NET Framework to interact with the user through Forms, Dialog Boxes and Controls. I managed to create all the forms that I need to interact with the user and they work very well together. But, now I want to use the first program that I made from conventional C++ with .NET Framework. In other words I want the user to input data (through Forms and controls) and then I want to manipulate the data mathematically (using the conventional C++ code) and out put the result (through other Forms and controls). So my question is how can I use the conventional C++ code with the managed code and which file(s) am I going to use? For example, I have the following files:- References: .. .. Source Files: AssemblyInfo.cpp Form1.cpp Form2.cpp Form3.cpp Stdafx.cpp Header Files: Form1.h Form2.h Form3.h Resource.h Stdafx.h Resource Files: .. .. .. ReadMe.txt Allen Tag: Need help in identifying a control Tag: 111597
  - 11
    - How to tell if file is text based I want my application to load any file that is text based (php, txt, rtf, asp, etc) - - just not any binary file In the Open file dialog, that's easy, but I want users to be able to load the files by drag/drop - - so therefore, I will need to check for the types of files. I could go through the different filetypes if FILENAME.endswith(".txt"), etc, but that would end up being pretty ridiculous How can I check the file, as it comes in, as to whether it's text based or binary? Tag: Need help in identifying a control Tag: 111595
  - 12
    - WPF Picture drag/scroll like Google Map Hi Guys, Just wondering if the WPF has a control to move picture on a form like google map? I know in .net 2 the picturebox doesn't have scroll function... Thanks James Tag: Need help in identifying a control Tag: 111593
  - 13
    - PNG as Form background Hi, Do you know how to enable the use of a PNG as a form background and hence enable per pixel alpha transparency ? I have found some code on the code project but it either does not work with Visual Studio 2005 (the form editor stops working because I need to inherit from a Form derivate) or I get a completely transparent application. Thanks for the help. Tag: Need help in identifying a control Tag: 111587
  - 14
    - Help with loaidng image into STATUSSTRIP item I need to load an image from my resource file into my STATUSSTRIP item. Please correct this... Me.stiConsole1.Image = My.Resources.mts_stbr_ico_service_offline_16.ToBitmap TIA John Tag: Need help in identifying a control Tag: 111583
  - 15
    - How to get mouse button state at any time? I mean, to know if mouse button is pressed, especially, at any time. thx. Tag: Need help in identifying a control Tag: 111582
  - 16
    - How to completely prevent captured mouse from getting grabbed by others? If one control has already captured the mouse, how to completely prevent the mouse from getting captured by any other controls (objects), even if a dialog popups, for example. thx. Tag: Need help in identifying a control Tag: 111581
  - 17
    - MaskedTextBox with negative double numbers I am trying to use a MaskedTexBox to accept positive and negative DECIMAL/DOUBLE numbers. I tried by setting the Mask to a custom mask of "0000.00" but that allows for no negatives. I tried with "+00000.00" but the same problem. According to the documentation there is a design variable ValidatingType. But at least in VC# Express 2005 such property does not appear in the list of properties at design time! So what I did was to manually set the ValidatingType to typeof(double) in the constructor. But the same problem persists. Any ideas? or was this some great half-baked idea? Tag: Need help in identifying a control Tag: 111580
  - 18
    - TreeView control Hi, I need bind a Treeview control in my windows form with xml file and also,,, display icons for each tree node.... how can I acheive it? Tag: Need help in identifying a control Tag: 111579
  - 19
    - Changing the focus rect of a button Hi, Is it possible to change the appearance of the focus rect of a button. More specifically when the button is flat the focus rect is different then in other style (a straight rectangle instead of a striped line) and i would like it to be striped as well. Can it be done without painting whole the button by myself? If not - is it possible to just remove the focus rect? Thanks, Toby. Tag: Need help in identifying a control Tag: 111574
  - 20
    - Value in ListBox.Items.Add Hi, How do I add items in ListBox in VB.NET with the value; ListBox.Items.Add("Text") only assign the text instead of the values. Thnx Tag: Need help in identifying a control Tag: 111572
  - 21
    - MDI Child Window Toolstrip does not go away Hi, I have an MDI child window with a toolstrip contained in a ToolStripContainer. The MDI parent also has a Toolstrip contained in another ToolStripContainer. If I drag my ToolStrip onto the parents ToolStripContainer and then close the child window, the toolstrip does not go away. This is not a merge issue. I am not using merge. What is the usual way to handle child window toolstrips in an MDI? regards, T Tag: Need help in identifying a control Tag: 111570
  - 22
    - BeginInvoke failing when executed in a form that was created in a worker thread... I previously posted this in the VB.General forum, but thought that this one might be a better place for it...sorry about the double post. I have created a simple form with code that looks like this: '****************************************************************************************** Public Class FEventRaiser Inherits System.Windows.Forms.Form Event MyEvent(ByVal eventName as string) Private Delegate Sub EventRaiserDelegate(ByVal eventName As String) Public Sub New() ...other code removed for clarity. 'Force the creation of the form's handle. While Not IsHandleCreated Dim temp As IntPtr = Handle End While End Sub Public Sub RaiseAnEvent(ByVal eventName As String) If Me.InvokeRequired Then 'Call made on thread different from the thread this form was created on...BeginInvoke. Me.BeginInvoke(New EventRaiserDelegate(AddressOf RaiseAnEvent), New Object() {eventName}) Else 'Call made on same thread as this form was created on...raise the event. RaiseEvent MyEvent(eventName) End If End Sub End Class '****************************************************************************************** If I create an instance of this form from within another form, and then make calls to 'MyRaiseEvent' from within a threaded timer, it works as I would expect: Public Class Form1 Inherits System.Windows.Forms.Form ... Private WithEvents mEventRaiser as FEventRaiser Private WithEvents mTimer as System.Timers.Timer ... mEventRaiser = New FEventRaiser mTimer = New System.Timers.Timer(1000) mTimer.Enabled = True ... Private Sub mEventRaiser_MyEvent(ByVal eventName As String) Handles mEventRaiser.MyEvent 'This event is handled on the same thread that this form's message pump is running on. Debug.WriteLine("Event processed on thread: " & AppDomain.GetCurrentThreadId) End Sub Private Sub mTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles mTimer.Elapsed mEventRaiser.RaiseAnEvent("This Works") End Sub End Class Even though the timer event handler is firing on different thread IDs than the main thread, the call to the mEventRaiser.RaiseAnEvent ends up performing the necessary BeginInvoke, which results in mEventRaiser raising an event back on the main thread...this is the behaviour I would expect (and want). If I then modify this code somewhat so that the mEventRaiser is actually created once in the timer event handler, then it all stops working (please ignore the hack method I used for instantiating the CEventRaiser object...the real way it's done is in a worker thread created at the same time the threaded timer is created). Here's the new timer event handler: Private Sub mTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles mTimer.Elapsed If mEventRaiser Is Nothing Then 'One-time creation of event raiser. It used to be created in the main thread, but now it's created in 'the context of the timer's first-time-firing thread. mEventRaiser = New FEventRaiser End If 'As before...ask event raiser to raise event. This no longer works. The BeginInvoke in the RaiseAnEvent call 'does nothing. mEventRaiser.RaiseAnEvent("This doesn't Work") End Sub End Class I hope you can makes sense of this code, and any insight you can provide would be greatly appreciated. Tag: Need help in identifying a control Tag: 111565
  - 23
    - Dbl-Click to load a file when app is already running I'm using the GetCommandLineArgs (VB.Net 2005) in my form load event GetOutsideFile(Environment.GetCommandLineArgs()) so that, when I have files associated with my app, and double click on a file, they will run the app and load the file in it. However, when the app is already loaded, double-clicking on a file will not load it, since the application is already running, and the only reference is in the frmMain's load subroutine. What do I need to do inside my app, to make this possible? Tag: Need help in identifying a control Tag: 111554
  - 24
    - ListBox crash when accessing SelectedIndex property. Can anyone please tell me how it is possible to get the following crash when accessing ListBox.SelectedIndex property: Message: Index was outside the bounds of the array. Stack Trace: at System.Windows.Forms.ListBox.ItemArray.GetEntryObject( Int32 virtualIndex, Int32 stateMask) at System.Windows.Forms.ListBox.get_SelectedIndex() It is not possible to use the ListBox.SelectedIndex = <some bad value> to put a bad value in there (I've tried and this causes an immediate exception), so I just can't see how the above crash is possible. The list box is sometimes set to be SelectionMode of MultiExtended, but the documentation does not say SelectedIndex is invalid with this mode. Can anyone please help? Thanks in advance, Valerie Hough Tag: Need help in identifying a control Tag: 111549
  - 25
    - weird problem with ComboBox - DataSource contains data, but the Items collection stays empty I created a custom control which simply is a data-bound ComboBox. It has a custom property that causes an ArrayList of KeyValuePair elements to be passed to the DataSource property. It also sets the DisplayMember and ValueMember properties. What's weird, is the fact that my control sometimes works fine and sometimes it doesn't. I have no idea why, but when I put on Form1 everything is fine, while on Form2 the Items collection stays empty, although the DataSource property contains data and it is exactly the same data (pulled from the database in the same way) that I use in case of Form1. I tried to use a DataTable instead of an ArrayList, but it changed nothing. Does anybody have any suggestions? Tag: Need help in identifying a control Tag: 111546

I have seen controls like the PropertyGrid that have a label titled
Properties and have a Pin and cCose button on the label. What control is
used to create the label with a pin and close button?

Bill

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Re: Need help in identifying a control by Ray

Ray
Sun Jun 03 17:35:16 CDT 2007

Often called a header control.

Not a native control in the toolbox if you are looking for it.

"news.microsoft.com" <billgower@charter.net> wrote in message
news:uJojv6ipHHA.4632@TK2MSFTNGP04.phx.gbl...
>I have seen controls like the PropertyGrid that have a label titled
>Properties and have a Pin and cCose button on the label. What control is
>used to create the label with a pin and close button?
>
> Bill
>
>
>

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