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- Previous
  - 1
    - A treeView node with multiple columns? Hello, friends, I need to have multiple columns in a TreeView node. How can I do this? Thanks a lot. Tag: Threading question Tag: 113695
  - 2
    - printing source code is there a utility program, other than 'VS.Net Code Print', that can print source code from a visual studio 2005 solution? 'VS.Net Code Print' is buggy and crashes before completing the print of my solution. Thanks!!! Tag: Threading question Tag: 113690
  - 3
    - binding CheckBox.Enabled to ComboBox selection I have a combo which is bound to a List<MyCustomObject>. One of the properties of MyCustomObject is a boolean which I would like to bind to a checkbox so that depending on the selection on the combobox, the checkbox below it would get enabled/disabled accordingly. How can this be achieved through databinding? I don't want to implement this through any event handling - just pure databinding. My initial effort was this: checkbox.DataBindings.Add("Enabled", combobox, "SelectedItem.MyBooleanProperty"); However, the above code does not work. Thanks Tag: Threading question Tag: 113688
  - 4
    - RTF Parsing super/subscript I'm looking for some sample code to implement super and subscript in an RTF control w/o using the baseline offset and font size division/multiplication. I want to actually use the \super and \sub tags from the RTF spec. Even some open source RTF editor would be fine. Java or C++ source would even be acceptable. Thanks Brian Tag: Threading question Tag: 113685
  - 5
    - Where is the application setting file? Hello, friends, As you know, we use application settings to store and retrieve property settings (such as window form size/location) for our application for each user. But, I could not find the file that stores all these info after running our app. (I think it should be under C:\Documents and Settings, but just could not find). Any ideas? Thanks a lot. Tag: Threading question Tag: 113672
  - 6
    - Class Finalize - how to kill a class Let's say I have a class - so to instanciate it, I put : dim cWhatever as New myClass My question is, do I need something to remove it from memory, once the form's closed? What are the recommended ways of doing this (in the class itself/in the form disposed event, or where/how)? Tag: Threading question Tag: 113671
  - 7
    - Spurious internet activity in simple forms application My vs2005 windows forms program is trying to access the internet at runtime. There is no network access in my code. Could it be due to the framework or the infragistics controls? I know that at build time the framework's license compiler tries to use dns or other internet access. Could this be happening at runtime also? Tag: Threading question Tag: 113667
  - 8
    - Question about DataGridView binding I have not used the DataGridView that much. I'm writing a Winforms app using a datagridview bound to a datatable. For reasons too involved to go into, the grid is not editable. When I need to edit a record, I double-click on a row and retrieve the keys as follows: key = <grid name>.CurrentRow.Cells("Column Name").Value.ToString Then do a find on the datatable and get the datarow. datarow = datatable.Find(key) Is this the simplest way to relate the datagridview and the datasource or is there something simpler? Tag: Threading question Tag: 113665
  - 9
    - Array initialization in class Hi all, I have an array defined in a class. The type of the array is the class type. For example: class MyClass { private int a; private int b; private MyClass[] Array; public MyClass() { a = 5; b = 2; Array = new MyClass[3]; } public void SetArrayFields() { Array[0].a = 1; Array[0].b = 8; } } What happens is that whenever I enter SetArrayFields() and try to set values to the array there is an error "System.NullReferenceException" Please help me to solve this problem Many thanks Tag: Threading question Tag: 113664
  - 10
    - Add question mark to title bar Hi guys, I'm working with a small Win App (.NET 2.0, C#) and I was wondering: Is there a way to add the typical question mark to the title bar of my app, and then link that question mark to an "About" box? (no help) I've been "googling" it but didn't find the solution... Thanks a lot. -- ____________________________ Carlos Sosa Albert Tag: Threading question Tag: 113662
  - 11
    - create nice interface with WPF Hi people, i would like try the new capability of WPF included in VisualStudio 2008 to create Nice (3D effect & more) but i dont know where to begin ? di you have any link how teach the begining to use WPF in VisualStudio 2008 With VB language... Thx a lot BTW, all WPF applications are in XAML format ? (sorry i dont know if i have posted i the right section) Tag: Threading question Tag: 113660
  - 12
    - Blue Screen Many of our users are getting the blue screen problem. The file psg.sys is being blamed for these crashes. No one has been able to find a psg.sys file on their system when a search is done. Anyone have any idea what is going on with these Win XP Pro systems? Thanks. mfeiner@csc.com Tag: Threading question Tag: 113659
  - 13
    - crystal report with image Hi, I am trying to develop a crystal report (invoice) and i need to show picture of the item in detail section. I do not see how can i do that.... I have picture of the item ordered in the file (on the machine i show report). The name is ItemId.jpg where ItemId comes from database OrderDetail table. Thanks George. Tag: Threading question Tag: 113656
  - 14
    - ERROR inrelease Hi, I've deployed a small application, by my opinion well tested, runs perfect on mu development (Vista) and test machine (XP) but when installed at the customers site, displayed an unhandeled exeption when loading the first form. PLease HELP!! thx System.InvalidOperationException: An error occurred creating the form. See Exception.InnerException for details. The error is: Input string was not in a correct format. ---> System.FormatException: Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseDecimal(String value, NumberStyles options, NumberFormatInfo numfmt) at System.Decimal.Parse(String s, IFormatProvider provider) at System.Convert.ToDecimal(String value) at NumericBox.NumericBox.set_Text(String value) at SolutionAdmin.frmOnderdelen.InitializeComponent() at SolutionAdmin.frmOnderdelen..ctor() --- End of inner exception stack trace --- at SolutionAdmin.My.MyProject.MyForms.Create__Instance__[T](T Instance) at SolutionAdmin.frmMaster.ProductsToolStripMenuItem_Click(Object sender, EventArgs e) at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e) at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e) at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met) at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met) at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ToolStrip.WndProc(Message& m) at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) -- Best regards Luc Tag: Threading question Tag: 113654
  - 15
    - When is a form disposed? (unexpected ObjectDisposedException errors) I have a multithreaded app that creates a progress form on the main thread and interacts with it from a worker thread. The code is more or less like this: void MainThread() { MyForm form = new MyForm(); ThreadPool.QueueUserWorkItem(WorkerThread, form); form.ShowDialog(); } void WorkerThread(object state) { using (MyForm form = state) { // do some work... } } So, the form can be closed manually by clicking a button on it (which sets DialogResult), or automatically when the worker thread is done and the "using" block terminates. I have written a thread-safe Dispose method, since it's called from a thread other than the one that created the form, and it looks more or less like this: delegate void DisposeDelegate(); void Dispose() { if (InvokeRequired) Invoke(new DisposeDelegate(Dispose), new object[] {}); else base.Dispose(); } My understanding is that ShowDialog() doesn't dispose the form when it returns, and indeed, Dispose() is only called once - at the end of the "using" block. The problem is that occasionally, Invoke() will fail with an ObjectDisposedException, even though it's the first time Dispose() has been called! I tried tracing through the framework with ILDASM to find the source of that exception, but with no luck. How exactly does the form know whether it's been disposed already, and under what circumstances is that flag set? Jesse Tag: Threading question Tag: 113652
  - 16
    - Help, App hanging after screen saver I have an VS 2005 C# app that hangs after the screen saver activates. The debugger shows the following stack when this happens. Does anyone know what the app is waiting for? STACK: [In a sleep, wait, or join] mscorlib.dll!System.Threading.WaitHandle.WaitOne(long timeout, bool exitContext) + 0x2e bytes mscorlib.dll!System.Threading.WaitHandle.WaitOne(int millisecondsTimeout, bool exitContext) + 0x23 bytes System.Windows.Forms.dll!System.Windows.Forms.Control.WaitForWaitHandle(System.Threading.WaitHandle waitHandle = {System.Threading.ManualResetEvent}) + 0xa1 bytes System.Windows.Forms.dll!System.Windows.Forms.Control.MarshaledInvoke(System.Windows.Forms.Control caller, System.Delegate method, object[] args, bool synchronous) + 0x36d bytes System.Windows.Forms.dll!System.Windows.Forms.Control.Invoke(System.Delegate method, object[] args) + 0x48 bytes System.Windows.Forms.dll!System.Windows.Forms.WindowsFormsSynchronizationContext.Send(System.Threading.SendOrPostCallback d, object state) + 0x61 bytes System.dll!Microsoft.Win32.SystemEvents.SystemEventInvokeInfo.Invoke(bool checkFinalization = true, object[] args = {Dimensions:[0x00000002]}) + 0x68 bytes System.dll!Microsoft.Win32.SystemEvents.RaiseEvent(bool checkFinalization = true, object key = {object}, object[] args = {Dimensions:[0x00000002]}) + 0x106 bytes System.dll!Microsoft.Win32.SystemEvents.OnUserPreferenceChanging(int msg, System.IntPtr wParam, System.IntPtr lParam) + 0x6f bytes System.dll!Microsoft.Win32.SystemEvents.WindowProc(System.IntPtr hWnd = 0x001e10a4, int msg = 0x0000201a, System.IntPtr wParam = 0x00000000, System.IntPtr lParam = 0x066462f0) + 0x288 bytes [Native to Managed Transition] [Managed to Native Transition] System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(int dwComponentID, int reason = 0xffffffff, int pvLoopData = 0x00000000) + 0x2ea bytes System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(int reason = 0xffffffff, System.Windows.Forms.ApplicationContext context = {System.Windows.Forms.ApplicationContext}) + 0x17d bytes System.Windows.Forms.dll! System.Windows.Forms.Application.ThreadContext.RunMessageLoop(int reason, System.Windows.Forms.ApplicationContext context) + 0x53 bytes System.Windows.Forms.dll!System.Windows.Forms.Application.Run(System.Windows.Forms.Form mainForm) + 0x2e bytes OmniProWms.exe!OmniPro.Wms.OmniProWms.Main(string[] args = {Dimensions:[0x00000000]}) Line 680 + 0x1a bytes C# Tag: Threading question Tag: 113651
  - 17
    - Draw over multiple controls When a user grabs the border of an object to expand the size or move it I would like to draw a rectangle to show the growing size or changing position. The problem is that the MouseDown eevnt is within the active control, while the line I need to be drawing is outside the control. To make things worse the line to be drawn may need to "float" over other controls on the page. If I draw on the canvas of the form the line is behind the visual controls on top. Question: How do I draw OVER the top of multiple controls? Tag: Threading question Tag: 113650
  - 18
    - Why is my .exe so large? This is a question. I have developed many vb.net Windows apps. Most apps .exe are under 100kb. The app I am presently writing is now 2400kb. What makes the exe get so large? I am vs2003 and .net framework 1.1. jwc *** Sent via Developersdex http://www.developersdex.com *** Tag: Threading question Tag: 113644
  - 19
    - Why is my .exe so large? This is a question. I have developed many vb.net Windows apps. Most apps .exe are under 100kb. The app I am presently writing is now 2400kb. What makes the exe get so large? I am vs2003 and .net framework 1.1. jwc *** Sent via Developersdex http://www.developersdex.com *** Tag: Threading question Tag: 113643
  - 20
    - Different DPI settings on monitor may make form layout displaced. Hello, friends, As you know, different DPI settings of monitors may make form layout displaced. In our app (developed at DPI 96 using c#.net 2005), some buttons are displayed only half at the bottom of a form when this app is running at DPI = 120 machine. Is there a way to make those layout DPI independant? Thanks a lot! Tag: Threading question Tag: 113642
  - 21
    - NativeWindow.OnShutdown is causing a StackOverflowException Hello, I have a .NET class that creates a form and displays it using ShowDialog. This .NET class has a COM visible interface that is called by the main app which is C++ COM. The form displays correctly and everything seems to be fine, but when the main app is closed I always get a StackOverflowException from NativeWindow.OnShutdown. By the time the app is closed I would think that everything regarding the .NET form has been cleaned up as the form has been closed and all related objects are out of scope. Any ideas? Tag: Threading question Tag: 113639
  - 22
    - Listbox captures focus This is very strange... I have a simple UserControl based on a System.Windows.Form. I have a databound listbox on the form, along with two radio buttons which aren't bound to anything. If I launch the form, everything is clickable. If I launch the form and navigate to any record in the listbox, I can no longer click any other control, except to close the form with the control box. None of the radio buttons are accessible. The visual feedback shows a click is occuring, but the click event doesn't fire, and despite autoCheck being enabled, the state doesn't toggle. This seems to be related to the databinding... but I can't imagine how. Anyone? Tag: Threading question Tag: 113636
  - 23
    - Get FileType Using System.IO, is there any way, using FileInfo or any other way, to tell what filetype the file is? In other words, if I have a group of files, and I want to do something with only .doc file, can I do this using the System.IO class, or am I just stuck with checking the last three characters of the filename (with substring)? Tag: Threading question Tag: 113635
  - 24
    - registry error hi, i'm trying to read out the registry keys in my win application.. but fir few keys..i'm encountering the below error "Request access to the registry isn't allowed". how can i solve it... what settings should i prefer? Tag: Threading question Tag: 113628
  - 25
    - reading registry hi, i've a requirement to scan the registry keys programatically in a console application and read the data of the keys.. given a registry key, say,"HKEY_USERS". user should be able to scan the subkeys of the given key recursively(i.e. all the subkeys of the given subkeys etcc..) till the last indent level.... i've used a recursion to do so..but it's taking lot of time.. is there any efficient way to acheive it..... Tag: Threading question Tag: 113627
- Next
  - 1
    - custom control focus Hello, I made a custom control which derives from UserControl, which handles mouse input (e.g., rotates an object) when the mouse moves. I am handling the OnMouseDown, OnMouseUp, OnMouseWheel, OnMouseMove functions. When I click on my control, it doesn't seem to get focus however, which is preventing me from getting mouse wheel input. If I use tab, I can get my control in focus and then it receives mouse wheel focus. How can I make my control have focus when the user clicks it? Tag: Threading question Tag: 113623
  - 2
    - restore from maximize When I maximize a form, it sends a resize event, which I handle. However, when I click the restore box on the form's frame, it restores the window dimensions (physically) but my resize code is not executed. I can tell it is not being called because my resize code calculates the center to display some output. What am I doing wrong? It only fails to work when I "restore down" from maximize. Tag: Threading question Tag: 113620
  - 3
    - control naming conventions, When I drag a control onto a form, visual studio gives it a dummy name. I'm wondering, what are good naming conventions you use for controls? I like to indicate the control type: for example, "submitButton" or "showResultCheckBox". Although I find this cumbersome sometimes. Also, I notice that in C#/.NET code, the m_ prefix for member variables is no longer popular, as it was in MFC. Do people use any notation to denote member variables in C#/.NET? I don't like to confuse them with local variables. Maybe it is popular to explicitly reference "this"? Tag: Threading question Tag: 113618
  - 4
    - control naming conventions When I drag a control onto a form, visual studio gives it a dummy name. I'm wondering, what are good naming conventions you use for controls? I like to indicate the control type: for example, "submitButton" or "showResultCheckBox". Although I find this cumbersome sometimes. Also, I notice that in C#/.NET code, the m_ prefix for member variables is no longer popular, as it was in MFC. Do people use any notation to denote member variables in C#/.NET? I don't like to confuse them with local variables. Maybe it is popular to explicitly reference "this"? Tag: Threading question Tag: 113617
  - 5
    - Deployment Problem I'm deploying a C# desktop application using a .Net deployment project. The application installs fine on my development PC, but it gives the following error when I attempt to install it on laptop that doesn't have the development tools: "The advertised application will not be installed because it might be unsafe. Contact your administrator to change the installation user interface option of the packae to basic." I've included the .Net Framework and the Cyrstal Reports msi as part of the deployment projectAny suggestions would be appreciated. Thanks Brad Tag: Threading question Tag: 113616
  - 6
    - flicker in control I have made a custom control which displays a 3D object. The user can use the mouse to animate the object. However, I am getting bad flicker from the control. I call Invalidate in the mouse move handler to animate the object. I think the problem is the control repaints itself and then I draw over that myself, so it gets painted twice causing the flicker. In Win32 I would use a null brush or handle the WM_ERASEBKGND message to prevent this. Is there a flag I can set in the control to let it know I will do all the drawing? Tag: Threading question Tag: 113615
  - 7
    - disabling SplitButton I'm needing to disable the button portion of the SplitButton while keeping the ability to display the DropDownItems and allow full functionality to them. Is this possible? using SplitButton.Enabled = False seems to disable the entire control. Thanks Rayne Tag: Threading question Tag: 113612
  - 8
    - Hide main form initially Hi there, Is there a way to start a Windows Forms application with the main window not visible? Then later on when an external event occurs, I want to display the form. Thanks. Tag: Threading question Tag: 113609
  - 9
    - Problems using CellFormatting event in DataGridView I'm writing a Winforms program in VB/Dot Net 2.0. I have a datagridview with 3 unbound fields that are filled in by the CellFormatting event handler, based on lookups using values of 3 other fields in the datagrid. Actually nothing is specifically 'wrong' but I'm wondering if anyone could give me some suggestions to improve it. First of all, performance could be better although I suspect this is in part due to a rather slow network. Any alternatives to or tweaks on CellFormatting that I might be forgetting? The actual lookup code is fairly simple. Second, I wonder if I'm making assumptions based on the old grid. I would like to hide the columns holding the lookup keys but I find if I set Visible to False, the lookup fails. The best I can do is wipe out the header text and set the column width to 2. Any ideas? Tag: Threading question Tag: 113607
  - 10
    - OpenDirectoryDialog? There doesn't seem to be a control that I can use for selecting a directory and having that directory path populate a text box, like I would with the OpenFileDialog control, like so: Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click OpenFileDialog1.ShowDialog() txtPhotosDirectory.Text = OpenFileDialog1.FileName End Sub Any suggestions? TIA, Jim Tag: Threading question Tag: 113603
  - 11
    - DataGridView.RowPrePaint - Fires 4 times per row I have 4 cells per row that i set the back color based on values: Select Case DateDiff(DateInterval.Minute, dateWork, Now) Case Is < 41 row.Cells(CN_DGVResToCall).Style.BackColor = Color.Green Case Is < 56 row.Cells(CN_DGVResToCall).Style.BackColor = Color.Yellow Case Else row.Cells(CN_DGVResToCall).Style.BackColor = Color.Red End Select This is repeated for 4 cells in the row. The RowPrePaint event is called 4 times per row. Is there anything i can do to eliminate 3 of the calls? maybe use another event like RowAdded? i will test a few things but was wondering if anyone ran into this. thanx.... Tag: Threading question Tag: 113602
  - 12
    - Childform How can I (programatically) bring a childform on top? -- Best regards Luc Tag: Threading question Tag: 113597
  - 13
    - WWW link on win form? How can I put WWW link on windows form so user can click on in and go to that page via external default browser? Thx you -- ______________________________________________________________________________ Dzemal Tipura, MCP, MCAD Wizard Computers d.o.o. dzemal.tipura@wizard.ba GSM: + 387 61 467 367 Tag: Threading question Tag: 113592
  - 14
    - Webbrowser-Control / Picture resizing Hi, we're using WebbrowserControl to show different documents like pictures, movies, word-Docs etc. Showing pictures in big resolution like 3048*2000 the webbrowser control shows only a small part of the pic (size of the webbrowser control). The IE has an option to resize pictures to visible browser. How can I perform this with the webbrowser Control? To resize the pics before showing isn't a good idea - or is it the only way? Thanks ! Peter Tag: Threading question Tag: 113591
  - 15
    - Clearing a dialog box to create a new record - suspend binding? Hello, I have a dialog box in which the user edits records. (The main form has a datagridview which displays all the records. The user normally selects the desired record and opens a dialog to edit that record.) There is also a [New Record] button on the dialog box which allows the user to create a new record. What steps must I go thorugh, with respect to the binidng, to perform this? Do I have to suspend binding, then empty the controls, then restore the binding? Please clarify all the general the steps for me. BTW the underlying table is not a child of another table so other IDs are not involved. Thank you, Doug Tag: Threading question Tag: 113585
  - 16
    - Where to add event handlers so they don't fire during form load Hello, Where do I put the code that adds my EventHandlers so that they do not fire during form load? ========= Here is my code: ========== public partial class AddEditMasterTask : bsfAddEdit { public AddEditMasterTask() { InitializeComponent(); // form title this.Text = ""; // Title lblDialogTitle.Text = "Add Master Task"; // Populate Dropdowns taPhase.Fill(dataSetHipAdmin.Phase); taMeasureDim.Fill(dataSetHipAdmin.MeasureDim); taMeasureUnit.Fill(dataSetHipAdmin.MeasureUnit); // Populate form taMTask.Fill(dataSetHipAdmin.MTask); // Disable Save button, Add Event Handlers ButtonSettingsAndEventHandlers(); } public void ButtonSettingsAndEventHandlers() { // Hide Save this.btnSave.Enabled = false; // TextChanged this.descriptionTextBox.TextChanged += new System.EventHandler(this.EditsBegun); this.baseTimeTextBox.TextChanged += new System.EventHandler(this.EditsBegun); this.ordTextBox.TextChanged += new System.EventHandler(this.EditsBegun); this.contractorCommentsTextBox.TextChanged += new System.EventHandler(this.EditsBegun); // CheckedChanged this.allowParticipationCheckBox.CheckedChanged += new System.EventHandler(this.EditsBegun); this.allowQuantityCheckBox.CheckedChanged += new System.EventHandler(this.EditsBegun); this.configuredDisplayCheckBox.CheckedChanged += new System.EventHandler(this.EditsBegun); // SelectedValueChanged this.fkMeasureDimIDComboBox.SelectedValueChanged += new System.EventHandler(this.EditsBegun); this.fkMeasureUnitIDComboBox.SelectedValueChanged += new System.EventHandler(this.EditsBegun); this.fkPhaseIDComboBox.SelectedValueChanged += new System.EventHandler(this.EditsBegun); } public void EditsBegun(object sender, EventArgs e) { // Change buttons after edits begin this.btnSave.Enabled = true; } =============================== The EditsBegun event fires during form load. What did I do wrong? Doug Tag: Threading question Tag: 113583
  - 17
    - Inserting Text into a Doc File I have a need to be able to insert various text strings into a .doc or .rtf file at specific locations. I know I could probably do this by reducing the .doc to a byte array but is there a better way? Thanks, Gary Tag: Threading question Tag: 113582
  - 18
    - Help with form painting performance (and background images) Hello, I have a UI that I would like to build using .NET 2.0 Windows Forms. This application uses a fair number of background images & Iâ??ve found that UI performance is not very crisp, with visible repainting of the form when resizing & restore/minimize occurs. Iâ??m looking for suggestions on how to improve UI performance of the application (short of removing the background images, which does help a lot). The original application was built with a mix of .NET 2.0 Windows Form controls, DotNetMagic controls, and a few custom controls. Iâ??ve stripped out the DotNetMagic controls and the custom controls, and the performance is roughly the same. The application, which at this point is only a mockup, contains a few tabsets, some groupboxes, a number of panels, a split container, several buttons, several text boxes & quite a few combo boxes. Most of the container controls (the form itself, the various panels, the tab pages, the group boxes) have background images set, and many of the other controls that donâ??t have an explicit background image set have their BackColor property set to Transparent. At this point, what Iâ??ve tried in terms of improving performance is to ensure the BackgroundImageLayout property on all controls with a BackgroundImage set uses Stretch rather than Tile. Iâ??ve seen a few articles that suggest premultiplying images with transparency into a bitmap file should improve performance, so I tried that. For example, hereâ??s what I did for the form: public class RForm: Form { private Bitmap _renderBmp; public override Image BackgroundImage { set { Image baseImage = value; if (_renderBmp != null) _renderBmp.Dispose(); _renderBmp = new Bitmap(this.Width, this.Height, System.Drawing.Imaging.PixelFormat.Format32bppPArgb); Graphics g = Graphics.FromImage(_renderBmp); g.DrawImage(baseImage, 0, 0, Width, Height); g.Dispose(); } get { return _renderBmp; } } } I replaced System.Windows.Forms.Form with my RForm class in the form.designer file. I did the same thing for the GroupBox, Panel, & TabPage controls. I didnâ??t find any really noticeable performance improvement. Outside of the image multiplication trick above and avoiding a BackgroundImageLayout setting of Tile, thereâ??s nothing Iâ??ve done to the vanilla Win Form app. As this is a mockup, itâ??s very simple: there is no data access, nor data binding (thereâ??s no data), nor network latency issues (everything is local), the form is not set to localizable, it was built using the VS form designer, so SuspendLayout/ResumeLayout are called appropriately as the form is built. Can anyone suggest anything else I might try? Iâ??ve placed my sample VS 2005 project (does not include code that overrides BackgroundImage properties to premultiply image), along with all the images, at this URL - http://www.geocities.com/notre_poubelle/FullUITest_SlowChromeNoDotNetMagic.zip - for anyone who wants to try to speed up the performance. The slow performance can be particularly noted in two scenarios: 1. Start the app. Minimize the app & restore the app a few times. Watch the form, particularly the groups boxes (and to a lesser extent the tab pages). Please also take note of the buttons on the panel below the menu strip (the IE7 looking buttons) and the Tab control immediately below that. 2. Resize the width of the form (make it about Â½ the default size, then resize to full size; repeat); you will notice quite a bit of flicker near the vertical bar that separates the panels in the split container control (i.e. the white panel on the left and the large panel containing the â??Contact Formâ??). I would like to explore all options to improve performance (Iâ??m looking at simplifying the form as a last resort option). I would like to attain the performance of unmanged apps, if possible when restore/minimize occurs or the main app window is resized. Although Iâ??d like to improve the actual performance, if I can improve the perceived performance (e.g. by not drawing the form somehow until everything is done), I would interested in suggestions in that way as well. Thank you, Notre Tag: Threading question Tag: 113578
  - 19
    - AutoScaleMode.Font crashes program Windows Forms, .net 2.0, vs2005, xp pro. Setting AutoScaleMode.Font (or Dpi) on my main form crashes my program on some computers. If I set it to None or Inherit program runs ok. It's a very simple form with a picturebox, combobox and a slider. .net 1.1 is not be installed on at least one of the problem computers. Is 1.1 sometimes required for 2.0 apps to run correctly? Error: EventType : clr20r3 P1 : myapp.exe P2 : 1.0.2816.19350 P3 : 46eebd1c P4 : myapp P5 : 1.0.2816.19350 P6 : 46eebd1c P7 : e P8 : 1 P9 : system.nullreferenceexception Tag: Threading question Tag: 113576
  - 20
    - Weird problem with Outlook, WebBrowser control and Windows Server 2003 I have an applaction, that is an addin for Outlook. It opens a form with a WebBrowser control wich then shows a page from a Webserver. It works fine, but when I installed it on Windows Server 2003 the page didn't get shown in the WebBrowser control. I have another application wich uses the same form, but is a standalone Winform-Application. This works on both machines (my development PC with Vista and the Windows Server 2003. Does anyone have an idea, what this cuold be, or any hint where to search further? Thanks Christof Tag: Threading question Tag: 113574
  - 21
    - Dataset problem with column named "System" The customer has a database with a column in a table named "System". I've been using this method for years now - create a dataset (an .xsd file) for the table. With a column named "System" in the dataset, it gives a substantial number of compile errors. To simplify the problem, add a Dataset with one table and one column called "System" - below follows how it can be done: Right click on the solution, click "Add", click "New Item" and then "DataSet" and DataSet1 is OK for the name. On the design sheet of DataSet1.xsd, right click. click "Add" and click "DataTable". Right click on the DataTable and click "Add" and click "Column". Rename the column from "Column1" to "System". Build the project = compile errors. Note that renaming the column to "[System]" rather than "System" does not work either. Tag: Threading question Tag: 113573
  - 22
    - Newbie Datagridview/Combo Box problem Consider these tables: Main Table - includes StatusID (showing StatusID, integer), Status which is based on Status Table - has StatusID, and Status (varchar) StatusID is a primary key in Status table, while StatusID in the Main Table is the Foreign key of the Status ID How can I add a combobox, using a sProc to get a list of whatever is in the Status Table And then, SHOW the status (text), based on the StatusID? (in asp.net, we have a value and a text property in the Dropdownlist to accomplish this) in the combobox - I set the DataPropertyName to StatusID (which is what the DGV would bring back) and the DisplayMember to Status, but it errors out, unless I set the DisplayMember to StatusID I need it to show the text - Status - - How can I accomplish this? Tag: Threading question Tag: 113572
  - 23
    - need help on regex hi, i'm a new bie to regular expressions.. i'm trying to see if a string ends with teh below pattern \filename.xls or \filename.xlsx... I've used the @"\\[\w|\W]+\.xls" pattern but's it's matching hte below string d:\sample\.xls.... can someone help me out with teh correct pattern Tag: Threading question Tag: 113569
  - 24
    - UI Updating Hi My Windows Forms applications consists of a listview control containing of approximately 1000 items, and a worker thread that performs a lot of execution. After performing some portion of execution I update the main UI by using a delegate on the main form to call an update function on the GUI thread. However, under times of high load my GUI seems to struggle to apply the updates requested, and portions of the screen (other buttons etc) are not repainted when I resize the window. Does anyone have any ideas how I can improve the responsiveness of the main window. It is important the list view is updated as execution in the worker thread requires, whilst at the same time the remainder of the window needs to stay responsive. Thanks in advance. Tag: Threading question Tag: 113566
  - 25
    - DataGridView Problem Hi All, I have a DataGridView on my form named dgv, and I have a button control on the same form named button1, the dgv is ReadOnly and with 2 columns (unbound mod), I typed this code in the event handler of button1: dataGridView1.RowCount = 4; TextBox t = new TextBox(); dataGridView1.Controls.Add(t); when I start the program and try to type in the textBox control all is good except the period character (OemPeriod) it not appear, but if the dgv is not readonly the period appears please help me. Note: my dgv without rowHeader and ColumnHeader Regards Tag: Threading question Tag: 113561

Let's say I have an event handler that spawns another thread
In that original event handler, is there a way to check, and do something
ONLY after the thread is complete?

Re: Threading question by Jon

Jon
Fri Sep 21 13:34:05 PDT 2007

Trust Me; I'm from the government <sm@here.com> wrote:
> Let's say I have an event handler that spawns another thread
> In that original event handler, is there a way to check, and do something
> ONLY after the thread is complete?

Give the thread a callback delegate to execute when it's finished. If
you want that marshalled to a particular thread, you'll need to use
something akin to Control.Invoke.

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

Re: Threading question by Trust

Trust
Fri Sep 21 13:53:10 PDT 2007

I'm brand new to threads -
could you get me to a very simple tutorial or code sample that shows how to
do this and explains it very simply?

"Jon Skeet [C# MVP]" <skeet@pobox.com> wrote in message
news:MPG.215e3b15554e6df4a2@msnews.microsoft.com...
> Trust Me; I'm from the government <sm@here.com> wrote:
>> Let's say I have an event handler that spawns another thread
>> In that original event handler, is there a way to check, and do something
>> ONLY after the thread is complete?
>
> Give the thread a callback delegate to execute when it's finished. If
> you want that marshalled to a particular thread, you'll need to use
> something akin to Control.Invoke.
>
> --
> Jon Skeet - <skeet@pobox.com>
> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
> If replying to the group, please do not mail me too

Re: Threading question by Jon

Jon
Fri Sep 21 14:56:33 PDT 2007

Trust Me; I'm from the government <sm@here.com> wrote:
> I'm brand new to threads -
> could you get me to a very simple tutorial or code sample that shows how to
> do this and explains it very simply?

I suggest you learn about threads in general from the start, then apply
it to your particular situation.

See http://pobox.com/~skeet/csharp/threads

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