Update datagrid in background thread

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  - 1
    - Need help with hiding datagrid columns I have the following code in place to size datacolumns according to the data in the cell. It seems to be working fine, But I am having a hard time hiding a column. I am not sure how to reference the column name. I think I need to reference a columnstyle, or perhaps a tablestyle, or maybe both. This is completely confusing me. If someone could educate me on the process, I would be very thankful. Some of the column names are as follows: Activity_Activity_CD Activity_Result_CD Activity_Date Activity_FollowUP What I would like to do is hide or set the width of a column (Let's use Activity_Date) to zero if radiobutton1 is checked. Any ideas? Do you need more information or code? Thanks, Aaron Look for ******* in the following code. Function DataGridApplyAutomaticWidths _ (ByVal DataGrid1 As System.Windows.Forms.DataGrid, ByVal NumberOfRowsToScan As Integer, ByVal MaxPixelWidth As Integer) _ As DataGridTableStyle 'Create graphics object for measuring widths. Dim Graphics As Graphics = DataGrid1.CreateGraphics() 'Define new table style. Dim TableStyle As DataGridTableStyle = New DataGridTableStyle() Try Dim DataTable As DataTable DataTable = DataGrid1.DataSource.DataSet.Tables(0) 'DataTable = DataGrid1.DataSource.Tables(0) 'Can only scan rows if they exist. NumberOfRowsToScan = System.Math.Min(NumberOfRowsToScan, DataTable.Rows.Count) 'Clear any existing table styles. DataGrid1.TableStyles.Clear() 'Use mapping name that is defined in the data source. TableStyle.MappingName = DataTable.TableName 'Now create the column styles within the table style. Dim Column As DataColumn Dim ColumnStyle As DataGridTextBoxColumn Dim Width As Integer For Each Column In DataTable.Columns ColumnStyle = New DataGridTextBoxColumn() With ColumnStyle .TextBox.Enabled = True .HeaderText = Column.ColumnName .MappingName = Column.ColumnName 'Set width to header text width. Width = Graphics.MeasureString(.HeaderText, DataGrid1.Font, MaxPixelWidth).Width End With 'Change width, if data width is wider than header text width. 'Check the width of the data in the first X rows. Dim iRow As Integer Dim DataRow As DataRow For iRow = 0 To NumberOfRowsToScan - 1 DataRow = DataTable.Rows(iRow) If Not IsDBNull(DataRow(Column.ColumnName)) Then Width = System.Math.Max(Width, Graphics.MeasureString(DataRow(Column.ColumnName), DataGrid1.Font, MaxPixelWidth).Width) End If Next ColumnStyle.Width = Width + 4 '*******Here is the condition check If RadioButton1.checked Then '*******HERE IS WHERE I WANT TO SET THE WIDTH OF SPECIFIC COLUMNS TO ZERO '*******(I THINK) End If 'Add the new column style to the table style. TableStyle.GridColumnStyles.Add(ColumnStyle) Next 'Add the new table style to the data grid. DataGrid1.TableStyles.Add(TableStyle) Finally Graphics.Dispose() End Try Return TableStyle End Function Tag: Update datagrid in background thread Tag: 65537
  - 2
    - Cursor won't stay as I set it (WaitCursor) Hi, I have an application where the login to the server could take 30-40 seconds. I have a main form with a "Login" button on it and a handler: private void btnLogin_Click(object sender, System.EventArgs e) { Cursor.Current = Cursors.WaitCursor; log.Debug("About to open session"); session = Session.Open("username", "password", "instance", "server"); log.Debug("Opened session"); btnAdapters.Enabled = true; btnCache.Enabled = true; Cursor.Current = Cursors.Default; } The Session class encapsulates the login/logout operations (which are interop calls to COM code). What's happening is that the Cursor stays as an hourglass for about 10 seconds and then changes back to an arrow - while the login is still executing. Session.Open doesn't return; the other buttons stay disabled and the form doesn't respond to mouse clicks immediately, but 20-30 seconds later (when the login operation completes), the other buttons are enabled and all of the mouse clicks I performed while the form appeared "dead" suddenly take effect (forms start popping up). How do I set the hourglass and kill the mouse for the full duration of the opration, like I could with VB6? If I replace the login code with a line that puts the thread to sleep for 40 seconds, I don't see the same behaviour: the hourglass stays around for the full 40 seconds and the form is truly dead to mouse operations - which is just what I want. Tag: Update datagrid in background thread Tag: 65536
  - 3
    - Of Icon lifetime and when is it truly disposed There are a number of things about using unmanaged resources in Windows Forms programming that is unclear to me. In C++, if you loaded an icon resource using "ExtractIcon()", the resource was valid until you called "DestroyIcon()". If you didn't, you had a leak. In C#, I need to load icons from unmanaged programs (.exe, dll) at run time and I want to make sure I'm not leaking resources, but it's not clear to me how to insure that I'm not. I've imported "ExtractIcon" and "DestroyIcon" like so: [DllImport("Shell32.dll", CharSet=CharSet.Auto)] public static extern IntPtr ExtractIcon(IntPtr hInstance, string strFileName, uint uiIconIndex); [DllImport("User32.dll", CharSet=CharSet.Auto)] public static extern bool DestroyIcon(IntPtr hIcon); I load a number of icons from the file system and stuff them into an "Icon" object and then into an ImageList. public static Icon extractIcon(string strPath, int nIndex) { Icon icon = null; IntPtr hIcon = WindowsAPI.ExtractIcon(IntPtr.Zero, strPath, (uint)nIndex); if (IntPtr.Zero != hIcon) { icon = Icon.FromHandle(hIcon); } return icon; } At this point, I've got an unmanaged recource being held by that "Icon" object. What exactly is going on here? Does the "FromHandle()" call make a copy of the resource into a *managed* resource? i.e. can I call "DestroyIcon" on the unmanaged hIcon at this point? Or would that destroy something that particular Icon object needs yet? Let's say I never call "DestroyIcon" - will the unmanaged Icon resource get cleaned up when the Icon's "Dispose()" method is called? (I know not to rely on the Dispose for resource cleanup, I'm just asking out of curiosity). Could someone please clear this up? I want to do this right. Thanks, Terry Tag: Update datagrid in background thread Tag: 65532
  - 4
    - custom sorting of ListBox controls Has anyone found some documentation on how to properly subclass a ListBox control and provide custom sorting (when the list items come from a DataSource)? The only way I can figure out how to do this is by sorting an array of some sort and then setting the DataSource. I don't like this because it fires the DataSourceChanged event. What I really want to do is get access to the underlying list items, sort them, and then have the control refresh itself. I already have access to the underlying list items since I have set the DataSource myself. But changing the order of the items in the DataSource does not appear to result in the items in the control being resorted. Any suggestions? Tag: Update datagrid in background thread Tag: 65531
  - 5
    - Winform DHTML WYSIWYG component I'm working on a desktop application in which we need a WYSIWYG html editor. We need to be able to not just edit text but add and move around images and other custom components. Is there anything from Microsoft or a third party that you can plug into a desktop application to do this? Preferably something with source code or that's well documented and can be easily extended. Thanks, Brian Tag: Update datagrid in background thread Tag: 65530
  - 6
    - Word template Hello everyone. I have a question that I tried to find an answer over the weekend but did not succeeded. I have a Word template with a couple of "tags" ( <<My Tag>>) that I need to replace with data from the DB. Please point me in the right direction on how to approach this. Code samples, links or articles. Anything would work. Thank you very much in advance. Tag: Update datagrid in background thread Tag: 65528
  - 7
    - How to know if a "Form" is currently running in background ? Hi. Actually, i'm working on C# projects in some french companies. Would anyone know how to know if a "form" is currently running in background ? Actually, I've implemented the following test in an application : Form myFormHandle = new Form1(); this.mySavedForm1 = myFormHandle; Form myFormHandle2 = new Form2(); this.mySavedForm2 = myFormHandle2; public Form mySavedForm1; public Form mySavedForm3; ...doing many many processes... ...then switch to form2 (eg: Form2.Show()); When I need to go back to Form1 from Form2, here's how I think : "Ok, starting point = I'm on Form2" "Is Form1 already existing ?" "If yes, just show it" "If not, recreate it" Here's how I translate this into the computer world : (I'm on Form2) if (Form1.mySavedForm1!=null) Form1.mySavedForm1.Show() else Form1 form1 = new Form1(); form1.mySaveForm1 = form1; form1.mySavedForm1.Show(); .... The problem seems to be on the "null" comparison... Is is a correct thing to compare form handles to null ? Thank you very much, microsoftmen! Tag: Update datagrid in background thread Tag: 65526
  - 8
    - Refreshing .config I'm overwriting appSettings in the .config using the XMLDocument object and then saving through. While this works fine the changes aren't visible ti my application until it restarts. Is there any way that I can refresh the config file while the application is running? Cheers, Eldon Ferran de Pol Tag: Update datagrid in background thread Tag: 65525
  - 9
    - Default: Everyone and not Just Me Hi, When installing an application with an msi-package, you have to choose on a sudden moment to install it only for the curent user (Just Me) or Everyone. The radio-button is default set on the Just Me option, but I'm looking for a way to set it on the Everyone by default. Anybody knows how to do this? Thanks! Pieter Tag: Update datagrid in background thread Tag: 65524
  - 10
    - Winform with background image and transparent usercontrols Hi, I have a form which has a background image. My problem is that when I load a user control its background hides my image. I used SetStyle(ControlStyles.SupportsTransparentBackColor, true); and BackColor = Color.Transparent; on each of my usercontrols and it works great, even the buttons do draw the background image on their back ! I have two problems : 1. ListView, TreeView and TabControl do not support this, they stay gray and white ! 2. When I maximize/minimize/resize my form it takes ages to refresh/redraw the form ! It is simply very very slow !!! Any ideas ? Thanks, Arkam Tag: Update datagrid in background thread Tag: 65523
  - 11
    - MDI Child with own (Main)Menu??? Is it possible for a MDI Child to have it's own (Main)menu, seperate from the MDI Parent's menu, so it's shown on the MDI Child itself?! Tag: Update datagrid in background thread Tag: 65522
  - 12
    - editing wizard/properties of crystal report Hi, I made a Crystal Report in my application with kind of a Wizard in it. But now I want to change some things (like the title of the report), but these things were set in that wizard, and I can't find them inthe 'normal' properties. Is there a way to edit a report with that wizard? Or change these values, or rerun it for a report with the used values already in it or something like that? Thanks a lot, Pieter Tag: Update datagrid in background thread Tag: 65521
  - 13
    - Data loss in rebind Hi, I have a DataGrid which I databind as this: BaseDataSetForUse.Tables["Market"].DefaultView.AllowNew = false; BaseDataSetForUse.Tables["Market"].DefaultView.AllowDelete = false; MarketGrid.DataSource = BaseDataSetForUse.Tables["Market"].DefaultView; In the DataGrid, two columns is marked as readonly (In the definition of the DataGridTextBoxColumn). If I in the WinForms-GUI, click in one of these columns before I re-bind again, I will get an error in the re-bind code. The re-binding of the DataGrid is done as the code above, that is I call the same code snippet again, but I reset the DataSet first: BaseDataSetForUse = BaseDataSetOriginal.Copy(); BaseDataSetForUse.Tables["Market"].DefaultView.AllowNew = false; BaseDataSetForUse.Tables["Market"].DefaultView.AllowDelete = false; MarketGrid.DataSource = BaseDataSetForUse.Tables["Market"].DefaultView; When I set the DataSource, then I get the following error message: "An unhandled exception of type 'System.ArgumentException' occurred in system.windows.forms.dll Additional information: Column 'IsExpired' does not belong to table Market." I have debugged the code and the column is still in the DataTable. If I doesn't click in one of the readonly columns, I do not get an error message. Could anyone please help me? -- Fredrik Arningsmark Tag: Update datagrid in background thread Tag: 65519
  - 14
    - Scrollbar visual problem in a TreeView Using VS 2003 ( C++ ), I've created a .NET Forms application. Added a TreeView docked to left, a Separator and a ListView docked to Fill ( not sure if relevant ). I've also enabled visual style using Application::EnableVisualStyles. The problem is that everything looks XP-ish ( I can see differences when I put the Name.exe.manifest to the same directory as the Name.exe ) except the TreeView's bottom scrollbar looks Win2k-ish ( even though no TreeViewNode exceeds the visible area of the TreeView ). When I expand the nodes until they go out of the TreeView visible area, the arrows from the scrollbar remain the same, while the center part of the scrollbar becomes XP blue-ish. If I collapse, the scrollbar dissapears ( as it should ). If I re-expand, the whole scrollbar looks as it should ( XP-ish ) Any ideas ? Tag: Update datagrid in background thread Tag: 65515
  - 15
    - How to get Windows Directory in C# Hi, Can any of you tell me how to get WindowsDirectory using C# Thanks Michael Tag: Update datagrid in background thread Tag: 65502
  - 16
    - VB Equivalent to Access Form BeforeUpdate Event? Hi, We have two fields in just about every table for UpdatedBy and UpdatedOn which we want to update if there are any changes to fields on the form. In Access we typically use the Form_BeforeUpdate event to accomplish this. How should we do this in vb.net? I've explored using the RowChangeEvent to assign values to the dataset, but of course this triggers another RowChange event! Do I need to have events for each control on the form? A little help needed! Thanks. Tag: Update datagrid in background thread Tag: 65501
  - 17
    - ListView: column width if View == List I am trying to adjust the width of a column when the View is set to "List" in a ListView object. If the View is set to "Details", setting columns widths is easy using the "ColumnHeader Collection Editor" (in Visual C#), but for the "List" I cannot find something similar. jg Tag: Update datagrid in background thread Tag: 65500
  - 18
    - Multiline DataGrid I'm trying to upgrade the DataGrid so that I can display multiple lines of text in one row. My method is to create a new class derived from DataGridTextBoxColumn. As suggested in http://www.dotnet247.com/247reference/msgs/20/100505.aspx I have overridden the 2 GetHeight methods. However, I can't override PaintText because it is not virtual or override. As a result, when editting the text it works great. When viewing, the rows are the correct height but the text is only one line Is there an easy way to do this, or do I have to rewrite the DataGridTextBoxColumn class myself? Tag: Update datagrid in background thread Tag: 65496
  - 19
    - Picture box locking image Hi, I suppose I must have missed something somewhere but I'm getting an error when trying to overwrite a file referenced by a picture box. Even if I set the image property to nothing I still get an error. I read somewhere that using a filestream based on the image would eliminate this problem but it didn't. Any ideas appreciated. Steve Tag: Update datagrid in background thread Tag: 65489
  - 20
    - Load next form in same window - not mdichild Hi I am fairly new to VB.net. I have a form through which I would like to load another form, like when the user clicks the next button. On the first form the user selects an option depending on which the controls for the next form are loaded after the user clicks the next button. The problem is that I dont want to open the new form in a separate window nor the mdiparent way either (i.e. like a child window within the parent). (I am trying to make interface flow much like an installation wizard where the user clicks next and further options open up within the same window) Thanks for the help in advance Michael Tag: Update datagrid in background thread Tag: 65484
  - 21
    - System.Drawing and GDI+ Question - Please help I have a winforms control that draws a rectangle for a boarder and positions some graphical elements around the control to create the boarder effect I desired. In the control I have overriden the onpaint event and added the code to draw my rectangle and position my graphic items: Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) e.Graphics.Clear(Color.FromArgb(255, 255, 255)) MyBase.OnPaint(e) Dim g As Graphics = pb1.CreateGraphics pb1.CreateGraphics.Clear(Color.FromArgb(255, 255, 255)) Dim myPen As System.Drawing.Pen = New System.Drawing.Pen(Color.FromArgb(187, 191, 115)) g.DrawRectangle(myPen, New Rectangle(0, 0, pb1.Width - 1, pb1.Height - 1)) pb1.Width = (Me.Width - 34) pb1.Height = (Me.Height - 29) tr.Left = (Me.Width - 32) br.Left = (Me.Width - 32) br.Top = (Me.Height - 24) bl.Top = (Me.Height - 24) End Sub Also I have added this line to the Public sub new call of the control: SetStyle(ControlStyles.ResizeRedraw, True) As you can see the rectangle is being drawn on a panel control called "pb1". When I drag this control onto a Windows form in Visual Studio the rectangle is drawn and behaves as it should when resized etc. However if I switch to antother tab and switch back the rectangle disapears, this is also the case when the solution is compiled the form initializes with no rectangle. Can somebody please help me or point me in the right direction. Tag: Update datagrid in background thread Tag: 65483
  - 22
    - Spacing between Textbox controls I'd like to have several Textbox controls within a panel. Each Textbox will have its .Dock property set to Top. This enables all of the Textbox controls to resize as the panel resizes, which is the effect I'd like. However, since each Textbox has its .Dock property set to Top, the Textbox controls have no space between them. I'd like to have some space between the Textbox controls. How can this be easily achieved? Or should I be satisfied that the Textbox controls have a common top and bottom edge? Thanks! Tag: Update datagrid in background thread Tag: 65482
  - 23
    - How to provide some vertical space between Docked text boxes I'd like to have several Textbox controls stacked vertically within a panel. Each Textbox will have its .Dock property set to Top. This enables all of the Textbox controls to resize as the panel resizes, which is the effect I'd like. However, since each Textbox has its .Dock property set to Top, the Textbox controls have no space between them. I'd like to have some space between the Textbox controls. How can this be easily achieved? Or should I be satisfied that the Textbox controls have a common top and bottom edge? What I am trying to achieve is a vertically stacked set of Textboxes, with some vertical space between them, that will automatically resize in width as the panel changes width. Thanks! Tag: Update datagrid in background thread Tag: 65480
  - 24
    - Bug w/ button having focus while in textbox There seems to be a bug where if you're in a textbox, a button can still have focus and prevent you from using the "enter" key in the multi-line textbox. This happens when you have a button and a textbox in a child form, go to another child and return back to the initial child. Here's how to re-create the problem: 1. Create a child form with a button and a MULTILINE textbox. 2. In the MDI parent form, open two of those child forms (you could do it in the OnLoad event) 3. Run the program. Two child forms should show. Let's call the child that's on top "child 1" and the other "child 2" 4. "child 1" is currently on top. Now, click on "child 2" and click back on "child 1". 5. Click on the textbox on "child 1" and hit return ("ENTER"). You will NOT be able to go down to the next line. It seems that upon re-activating "child 1", the form gives the button the focus again, but does not "release" the focus even when you put the cursor in the textbox. So, even though you click on the text box & put the cursor there, hitting ENTER still makes the form fire the Click event on the button. I have not found anything like this in the KB. If you have any workaround or know the solution please let us know. Thanks! jgc Tag: Update datagrid in background thread Tag: 65479
  - 25
    - mdi, max child Hi, I have a windows form which has the following properties: 1) form1.IsMDIContainer = true; 2) panel1.Dock = DockStyle.Right; Then I create a new child window and set its properties: 1) FormBorderStyle = FormBorderStyle.None; 2) WindowState = FormWindowState.Maximized; But what happens is the half right of this child window is covered by the panel and it's still showing the header of the window (icon, name, min, max, and close buttons). My questions: 1) How do I make the child window maximize only on the left half on the parent window (not to make it behind the panel)? 2) How do I hide the header of the child window when it's maximized? Please advice, thanks! -CL Tag: Update datagrid in background thread Tag: 65478
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  - 1
    - Recompiling samples via command-line We wrote a class library and then we created aprox. 30 demo projects for both C# and VB. They all have the copy local set to true and it will be like that until the end of the development. So, everytime we change the library someone has to open each sample and recompile it or have a batch file copy the new version of the dll in the bin files. I wanted to create a batch file to run the command-line for the compiler for each project, so I was wondering how can I get a snapshot of the EXACT command line that VS.NET runs in the background while compiling a project? Thank you, iulian Tag: Update datagrid in background thread Tag: 65470
  - 2
    - DataGrid ScrollBar Is it possible to make a scrollbar appear at all times on the datagrid? G Tag: Update datagrid in background thread Tag: 65467
  - 3
    - VS build result as dll In Visual Studio, how to configure the build result as dll. Please advise. Peter Tag: Update datagrid in background thread Tag: 65465
  - 4
    - MessageBox problem Hello, I'm trying to achieve the following: 1. Have a windows form open a modal MessageBox (with MessageBox.Show()) 2. Minimize (or hide) this form along with the open MessageBox. 3. Restore the form, so it returns to its original state - with the MessageBox open modally above it (and at the same place in the form code of course - the call to the MessageBox.Show() method. My problem is whenever I hide the MessageBox (using the Hide method or Win32 api call) the MessageBox.Show() method returns (as if the MessageBox has been closed). How can I avoid this behavior and achieve steps 1-3? Thanks. Tag: Update datagrid in background thread Tag: 65464
  - 5
    - Remote Access Service Window Hi, How to call the remote access services window from vb.net ? I would like to launch to this window when I m not connected to the internet. Thanks for your help Stan Tag: Update datagrid in background thread Tag: 65458
  - 6
    - Cannot open derived form in design view if the base form is marked 'abstract'. Hi folks! I have a BaseForm class that inherits System.Windows.Forms.Form. It has a property, whose value I need supplied by the class that inherits it. The BaseForm usees the value supplied into this property in its Load event. So, I gave the BaseForm and the property 'abstract' modifier, and put the implementation of the property in the inherited class; say MyForm. However, when I did this, I no longer can open MyForm in the design view. I'm stuck if I can't visually design MyForm.... :( Would appreciate any input, even if it means altogether different way to accomplish. thanks! -Yasutaka Tag: Update datagrid in background thread Tag: 65454
  - 7
    - Resize to "Normal" from Maximized fails with ClientSize reset to {0,0)!? The problem: WinForms app with main form and one NotifyIcon (called sysTrayIcon in my code). Main form starts out minimized with ShowInTaskBar = False. Double clicking on the system tray icon displays the form. All looks/works well except.... If you: [1] start the app [2] double-click on the system tray icon to display the ("normal" sized) main form [3] maximize the main form [4] minimize the main form [5] double-click on the system tray icon to re-display the (still maximized) main form [6] click the "normal size" button (between minimize and close in the title bar) the main form now displays nothing more than the title bar, as if there were no client area at all. What the heck is that?! Looking at the messages going through the message pump it looks like the main form is being sized correctly the first time, but is then being resized down to 0,0 twice. Why is that happening??? Here's the custom bits to add to the default WinForms app: private void Form1_Load( object sender, System.EventArgs e ) { this.WindowState = FormWindowState.Minimized ; this.ShowInTaskbar = false ; } private void sysTrayIcon_DoubleClick( object sender, System.EventArgs e ) { this.ShowInTaskbar = true ; this.WindowState = FormWindowState.Normal ; } private void Form1_Deactivate( object sender, System.EventArgs e ) { if( this.WindowState == FormWindowState.Minimized ) { this.ShowInTaskbar = false ; } } This has me puzzled. I'm not much of a UI guy (as if you couldn't tell). The cause *is* related to my code (shown above) because the default WinForms app doesn't do this (already checked). Many thanks in advance for any help you can offer. -Jason Tag: Update datagrid in background thread Tag: 65450
  - 8
    - Display menu items programatically in C# Hi, I was wondering if it is possible to display menu items inside code, i.e. to simulate the click event to menu items. E.g. menu File has a number of menu items( new, open, ... ). I want to display those submenu items programmatically. Thanks for your kind help in advance. (Sorry I did not indicate which language is it.) Michael Tag: Update datagrid in background thread Tag: 65449
  - 9
    - Display menu items programmatically Hi, I was wondering if it is possible to display menu items inside code, i.e. to simulate the click event to menu items. E.g. menu File has a number of menu items( new, open, ... ). I want to display those submenu items programmatically. Thanks for your kind help in advance. Michael Tag: Update datagrid in background thread Tag: 65446
  - 10
    - Hide from Task Manager I have a program that I wrote that sits in the system tray. I would like the to make this invisible to the Task Manager. I know that you could do this fairly easily in Windows 95/98 with the RegisterServerProcess API call. This has been removed from Windows 2000/XP and I would like to know if anyone know how to accomplish this. Any code or sources of code would be appreciated. Tag: Update datagrid in background thread Tag: 65443
  - 11
    - Typed DataSet How come a Typed Dataset has a name(DataSet1) and a datasetname(DataSet)? I only seem to use the the name and not the datasetname. Tag: Update datagrid in background thread Tag: 65442
  - 12
    - Binding a PictureBox Control to A ImageList - what field to bind to? I am trying to bind a simple ImageList Control to a PictureBox. I can't seem to find in documentation, or through trial and error, the right ImageList data member to bind to. Nothing seems to work. The code below attempts to bind the PictureBox "pbMain" to the ImageList "ilPics" which is successfully loaded with images from a test directory. The question mark in the "DataBindings.Add" method indicates the parameter in question. Has anyone else successfully done this and could you help me out? private void PicView_Load(object sender, System.EventArgs e) { // Get all files in sample directory DirectoryInfo dirImages = new DirectoryInfo("C:\\data\\All Images\\image.assets"); foreach (FileInfo file in dirImages.GetFiles()) { if (file.Extension == ".jpg") { Image myImage = Image.FromFile(file.FullName); ilPics.Images.Add(myImage); } } // bind to picture box pbMain.DataBindings.Add("Image",ilPics, ?); } Tag: Update datagrid in background thread Tag: 65430
  - 13
    - Retrieving accessible objects from treeview32 I am trying to generate a gui test for a treeview32 form which was created by a c# application on .net. I am using the pearl AO class in the win32 ActApp library. My script works fine for other applications I have tested not written with c#. When I try searching the accessible object tree of the c# treeview32 form I get undefined values for the Application tree node. Any ideas whats going on? This is where the output from the AO tree dies. menu bar:Application {invisible,(0,0,0,0),id=0,00120a02}: ?:(undef) {?,(location error),id=-4,(no HWND)}: Thanks, Jonathan Tag: Update datagrid in background thread Tag: 65429
  - 14
    - Changing compile order within a project I started with two projects in a solution, one containing a BaseForm and the other an enherited ChildForm. I decided to move the BaseFrom to the second project and changed the inherited form to look in the local project for its parent. However, until the baseform compiles, the child form cannot find it. I am guessing that I may need to change the compile order in the second project to compile the baseform BEFORE the associated enherited forms. Am I correct and, if so, how to I change the order? Tag: Update datagrid in background thread Tag: 65427
  - 15
    - How to use windows forms controls in a visual c++ app In Visual Studio 7 I have a C++ dialogbased MFC application project. When I open the main form of my application the only available tools from the toolbox are those in the "Dialog Editor" section. The components in the "Windows Forms" are all disabled so I can't e.g. add a mainmenu to my project. Why are these components not available when I'm in this mode (in a c# project they are all available) ? How do I add a main menu and panel component to my C++ form ? Tag: Update datagrid in background thread Tag: 65424
  - 16
    - ANN: SharpLibrary 1.37 Released Main features of this release are: 1- A great number of controls --where applicable-- now support XP Themes and in some instances even an Office 2003 like look. 2- Two new controls: IPAddessCtrl and LabelEx control have been added to the ToolBox. (This brings the total count to 52). 3- Ten new samples showcasing all of the new features added to the library. (This brings the sample count to 70). For a detailed breakdown of all changes in new version, take a look at http://24.199.8.122/LatestRelease.aspx Regards, http://www.sharplibrary.com Tag: Update datagrid in background thread Tag: 65422
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    - GetWindowLong on GWL_EXSTYLE fails with error 127 Simple, really. I have C# code in a Windows Form, thus: int rc; rc = Win32API.SetParent(ctrl.Handle, new IntPtr(Win32API.GetDesktopWindow())); rc = Win32API.GetWindowLong(ctrl.Handle, Win32API.GWL_EXSTYLE); if (rc == 0) { System.Console.WriteLine(Marshal.GetLastWin32Error()); } where ctrl is a control on the form (it doesn't seem to matter what type of control), and Win32API has all the relevant imports: [DllImport("user32.dll")] public static extern int SetParent(IntPtr childHwnd, IntPtr parentHwnd); [DllImport("user32.dll")] public static extern int GetDesktopWindow(); [DllImport("user32.dll", CharSet=CharSet.Auto, SetLastError=true)] public static extern int GetWindowLong(IntPtr hWnd, int nIndex); I'm doing this as a precursor to making the control a custom drop-down of sorts (subsequent lines will set WS_EX_TOOLWINDOW, HWND_TOPMOST, etc. and subclass the GWL_WNDPROC for mouse handling etc.), but I don't even get that far. In all cases GetWindowLong returns 0, and the Win32Error is 127 (which decodes as 'The specified procedure could not be found.') Anyone successfully done this from .NET? Tag: Update datagrid in background thread Tag: 65418
  - 18
    - ComboBox Items problem Hi....I have a problem with the combobox it's that it show the System.Data.DataRowView in the ListItems...What is the problem if a set my combobox with a datatable and that datatable have the data to show Tag: Update datagrid in background thread Tag: 65412
  - 19
    - MDI Form Problem I have an MDI form as a controlling form for my application I do have several MDI Child Forms that are displayed within the app., but only ever 1 at a time The problem is, when loading one of the forms, the MDI parent appears to go transparent for a second or so whilst the MDI child is loaded. I think it is due to processing the running in the form load event I have tried Suspend / resume layout, hiding the form, minmizing the form etc. but nothing seems to work. Any suggestions please Thanks Andy Tag: Update datagrid in background thread Tag: 65393
  - 20
    - MenuItem tooltips Is there some way of having Tooltips in a menu item? So far I have found no such method. If this is impossible, is there some other way of displaying hint information, such as changing the status bar text depending on what menuitem is highlighted? Any easy way to go about doing this? Tag: Update datagrid in background thread Tag: 65388
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    - Programm uses 90% of the CPU Hi *, has anynone the same problem or a solution? If my App is minimized it will use about 90% of the cpu after 5 minutes. The App doesn't do anything(like timers or stuff like this). Thanx a lot Tobi Tag: Update datagrid in background thread Tag: 65386
  - 22
    - Hashtable enumeration How can I loop thru a hashtable changing the Value of each entry ? Whatever I try I always seem to get the error about modifying the collection within the loop. Tag: Update datagrid in background thread Tag: 65377
  - 23
    - Assistance with datagrid required I have a simple SQL query that is executed when a command button is clicked. This populates a datagrid and is working fine. I have three radio buttons on the same form and when one of the radio buttons is CHECKED and the command button is pressed, a different query is executed, but the returned records are appended to the first record set. I would like to clear the contents of the datagrid when the command button is clicked and the radiobutton is checked, then populate the data with the recordset returned from the query. Any ideas? Aaron Tag: Update datagrid in background thread Tag: 65375
  - 24
    - DataGrid Data Validation Question Hi all! I have a datagrid control that I would like to have some data validation before saving it to the database. Is it possible that I could implement a data validation while the datagrid is in an edit mode? Thanks a million! -A Tag: Update datagrid in background thread Tag: 65374
  - 25
    - capture the mouse (to grab the window content) [not with SetCapture and not with hooks] Hi there, I write a small applicaiton in C# to mimic the SnapShot/32 application functionality. I use Win32GDI rountines to grab the images and this is the easy part. The difficult part is to mimic the SnapS way of letting user to select a window he/she wants to snap. It works like this: 1. the user does whatever he wants in the system 2. he/she presses some hotkey (RegisterHotKey) and the SnapS gets active (but does not show its window) 3. instead the mouse cursor is globally changed to a cross and globally captured until the first click 4. when the user clicks a window, its image is captured my problem is the number 3. I've tried to capture the mouse with SetCapture/.Capture = true but it does not work when the capturing window is not a foreground window. I also try to change mouse cursor shape globally with no results. I am sure that SnapS does not use any hooks (and I also do not want to). the question is: how the described functionality is achieved? thanks for any clues, Wiktor Tag: Update datagrid in background thread Tag: 65372

Hi,

I'm working on an app with one form which I need to update every
minute or so in the background. This form contains a datagrid, and
users should be able to leave it open in the background while they
work on other things. So far I've created a background thread that
queries the database and returns updated data in a DataTable, but when
I try to update the datasource of the grid to the new table, the form
gets the focus.

Does anyone know of a way to update the data displayed in a datagrid
while the datagrid's form remains in the background?

Thanks.

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