Big Red X on DataGrid

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- Previous
 - 1
 - Paging a DataGrid or similar control...? I have a windows application that returns 10s of thousands of rows to a DataGrid (for all intents and purposes you can assume that it's a DataGrid, I'm actually using the Infragistics UltraWinGrid though). Due to the ever growing amount of data I want to implement some sort of record paging. There are a lot of examples for ASP.Net but not many for windows applications. I am planning to use some of the techniques used for ASP.Net, but I was hoping someone out there may have a few suggestions specifically for a windows application. Also, I am using MSDE as my database backend. Thanks Tag: Big Red X on DataGrid Tag: 79158
 - 2
 - Cannot set Visible=True with WinRes.exe My company is pretty excited about using WinRes.exe to localize forms. However, I recently noticed what I believe is a bug in WinRes. If I set a control's visible property to False in my winforms application, and then I want to make that control visible with WinRes.exe. More specifically, it will let me change the visible property to True, but it will not save that change to the .RESX file. Interestingly enough, if a control is visible by default, I can easily hide it by setting Visible = False in WinRes. That works just fine. It's the other direction that I can't go. This is a serious drawback for us. Has anyone seen this problem? Is there a new version of WinRes.exe or something that fixes this? I can work around it, but the work arounds are very ugly and before I do I'd like to make sure that other people get the same behavior and that there isn't a known fix. Any help is appreaciated, AJ More info: I peaked "under the hood" and it appears that when I set the visible property to False originally, the default .RESX file gets an xml element for the Visible property of the control with a value of False. All is well. I then edit the RESX in WinRes, and set the visible property to True. Rather than changing the value of the xml element, it actually removes the entire xml element from the RESX file that it saves. Very odd. If I then build a satellite resource using that RESX file, the control does not show up when I run the applciation. Other changes that I make (e.g., moving stuff, changing labels) with WinRes save just fine and show up when I run the application. Tag: Big Red X on DataGrid Tag: 79156
 - 3
 - ActiveX Control Running on Separate Thread Hi all, I have an ActiveX control developed in Visual C++ 6.0 that I want to use in a C# project. I want the ActiveX code to run on a separate thread, but can't seem to get it to work. If for example my ActiveX member has an infinite loop, the .NET app gives all processing to the ActiveX and never returns, not even to redraw the window. Here is what I tried (in a nutshell): VC++ 6.0 OCX code: void CMyAXControlCtrl::Loop() { while(1) {} // infinite loop } C# application code: private void MyThreadTask() { axMyAXControl1.Loop(); // calls the ActiveX infinite loop function } private void foo() { threadAX = new Thread(new ThreadStart(this.MyThreadTask)); threadAX.Start(); } Note that my Main function in C# is declared with [STAThread], if I declare it as [MTAThread] I get an unhandled exception of type 'System.Threading.ThreadStateException' in system.windows.forms.dll (Could not instantiate ActiveX control because the current thread is not in a single-threaded apartment.) Of course if I do not use an AX control and have the equivalent code in my C# project, the threading works fine (just made sure!!!): private void MyThreadTask() { // axMyAXControl1.Loop(); // calls the ActiveX infinite loop function while (true) {} } private void foo() { threadAX = new Thread(new ThreadStart(this.MyThreadTask)); threadAX.Start(); } Thanks in advance, Javier Bertran Tag: Big Red X on DataGrid Tag: 79154
 - 4
 - TreeView refresh and reselect Hi all, I have a TreeView control which at times is updated (rebuilt) to reflect changes done by the user. However when this happens the currently selected node is of course deselected. How do a make a nice and professional solution that reselects the same node after update? (if it still exists). I notices that there is a property FullPath in the a TreeNode. But the TreeView doesnt seem to have a method like SelectByPath(). Any recomendations here? /ANdreas Tag: Big Red X on DataGrid Tag: 79150
 - 5
 - Smooth scrolling image or picturebox Hi all. I have a user control that contains a picturebox within a panel with the panel set to autoscroll the picturebox. One thing that I have noticed with the default functionality is when you click and drag the scroll box (thumb track) the picturebox does not scroll until you release it. Is there a way to scroll the picturebox while you move the scrollbox (like when you scroll a web page)? Or do you have to use the scroll bar controls instead of autoscroll and manually code this functionality? Any ideas? Paul Tag: Big Red X on DataGrid Tag: 79140
 - 6
 - Why does Button.ForeColor change button's border ? Hello, Surely I'm missing something obvious. How do you change a button's text color without causing a change to the button's border? The following line of code causes the button to be drawn with a yellow border: btnTest.ForeColor = Color.Yellow; Thanks, Jeff Tag: Big Red X on DataGrid Tag: 79137
 - 7
 - UserControl behaviour at author-time design-time and run-time Hi all, Can a user control be written in such a way that it can behave differently depending on whether it is being authored, being used on a form in VS2003 and being used at runtime? If so, how does it tell the difference between these environments? I am developing a user control based on the ListView control that will display a subset of the application event log, given a named event source. In order to make the control show event log data in design-mode as well as at run-time, I altered the constructor so that it would populate the ListView. To avoid unwanted delay, the function that populates the ListView runs in its own thread. Despite this, there is a significant delay when I switch from code-view to design-view in a WinfForms app that uses this component, during development. It takes about 15 seconds to switch views. Is there anything I can do to avoid this. I am trying to deisgn the control so that it looks the same at design time as it does at run-time. Regards, Ian. Tag: Big Red X on DataGrid Tag: 79134
 - 8
 - Missing scroll bars on datagrid I have a form. It has a datagrid which is disabled. It has a button which enables the datagrid. It has a dataadapter and a connection object and they are configured to get some data. It has a dataset with the code necessary to fill it using the dataadapter and to bind the first table it to the datagrid. When the button is pressed the datagrid is enabled as expected but the scroll bars are not included. Is there a fix? Tag: Big Red X on DataGrid Tag: 79133
 - 9
 - How do I set the of the datagrid horizontal scroolbar position? I want the horizontal scrollbar location to be altered during runtime. I have read msdn, and the scroolbar property of the datagrid is readonly, so there seems to be no apparent way to simply set it. My next guess was to override the HorizScrollbar property and play wiht the datagrid controls collection... but I was unsuccessful How should I do it?? Wha I really need is a public property of the datagrid that allow me to set and get the horizontal scrollbar location at runtime. kind regards Henrik Tag: Big Red X on DataGrid Tag: 79130
 - 10
 - RichTextBox Images OK, when inserting an image within a Rich Text Area is there any method to stop the image from being resized? Thank you. Tag: Big Red X on DataGrid Tag: 79127
 - 11
 - Winform becomes unresponsive Hi all, basically i have a WMI scanner which i install as a windows service. using .NET remoting the service registers an object which records the status of the scanner (ie how many assets its' scanned so far etc..) I then have a windows application which reads the status object to display the progress of the scanner (ie which asset is it scanning and an overall % complete) This all works fine when i scan up to 50 assets but i am in the process of load testing the scanner and am increasing the number of scans to 100, 150 etc.. the scans do work but the windows application basically locks up for the majority of the scan. I have a thread on the scanner service which starts up the scan and sleeps inbetween scans for x minutes. the scanner itself uses a threadpool to scan all the assets on the network and a thread to upload results to a webservice. I am using a timer on the windows application to check the status obejct every second and then display the results on the form, this seems to be the bit that keeps locking up (only when lots of assets are being scanned tho) how can i keep my windows application responsive, no matter how many assets i am trying to scan? Tag: Big Red X on DataGrid Tag: 79125
 - 12
 - DataGrid - Background colours? I want to enumerate the cells in my datagrid and specify different background colours for each cell depending on its contents. Is this possible? There are no properties for DataGrid.Item(Index, Index)... Tag: Big Red X on DataGrid Tag: 79121
 - 13
 - DataGridBoolColumn with multiple values (override SetColumnAtRow) I have a table that I have to show in a DataGrid. One of the columns in the table is column that shows some states. When reading it, the states will be one of -2, -1, 1 or 2. After the user modifies the column, it will have to save -2 for false and 2 for true. The problem is that I have to show these values as a check box, i.e. for each value < 0 to show an unchecked checkbox and for values > 0 to show a checked checkbox. I tried to make my own class derived from DataGridBoolColumn and to override the methods SetColumnValueAtRow and GetColumnValueAt Row. Here is the code: protected override object GetColumnValueAtRow(CurrencyManager lm, int row) { DataView view = (DataView)lm.List; if(Convert.ToInt32(view[row].Row[this.MappingName]) > 0) { return true; } else { return false; } } protected override void SetColumnValueAtRow(CurrencyManager source, int rowNum, object value) { DataView view = (DataView)source.List; if(Convert.ToBoolean(view[rowNum].Row[this.MappingName])) { value = 2; } else { value = -2; } } Well... the problem is that it doesn't work too well. I can see the checks all right, but I cannot change them. I think that the problem is that I don't understand too well the role of the CurrencyManager object. I couldn't find any example on the net on how to override SetColumnValueAtRow. If anybody knows how to do it or has another idea please post it. Thank you! Tag: Big Red X on DataGrid Tag: 79120
 - 14
 - CheckedListBox issue Hi now I.m a little confuse I need to loop a CheckedListBox (only the CheckedItemCollection) . I cant use a for each loop because I need to get the current and the next item in the collection, so I need index (I guess..) and I'm using this code: For i = 0 To lstLista.CheckedIndices.Count - 1 Step 2 FunctionPrint(lstList.Items.Item(i) +" " lstList.Items.Item(i + 1) Next the problem is that I'm not retrieving the items I want (the Checked items) and I cant find the instruction to get the CheckedItems using indexs any sug ken Tag: Big Red X on DataGrid Tag: 79108
 - 15
 - ComboBox Bug I have a Combobox with the following properties: Me.cboAddServices.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList Me.cboAddServices.DropDownWidth = 240 Me.cboAddServices.Location = New System.Drawing.Point(32, 16) Me.cboAddServices.Name = "cboAddServices" Me.cboAddServices.Size = New System.Drawing.Size(225, 21) Me.cboAddServices.TabIndex = 60 This comboBox in placed inside a groupBox that is on a TabControl. The comboBox control is populated through the datasource property by a dataSet table. I have seen many problem related to tabControls & comboBoxes but none are like mine. My problem is that when I select a listItem in the comboBox it reselects the first item. After a second attempt on selecting the SAME item it highlights it. This has to be done for each listItem in order to select it. Any ideas? Tag: Big Red X on DataGrid Tag: 79105
 - 16
 - opacity property not working Let me start by saying that I have successfully used the Form.Opacity property in many other windows in my application. I have several forms that inherit from a base class form that do not seem to respond to the Opacity property. I've tried setting it in the designer and programatically. I've inspected the property in the debugger and it shows up at Opacity = .75, as desired. As I said, I can successfully put other windows that have varying levels of transparency up at the same time which work just fine. Any help would be appreciated. Thanks, Davey Tag: Big Red X on DataGrid Tag: 79103
 - 17
 - Application crash caused by ToolTip.RemoveAll. If you install .Net Framework 1.1 SP 1 or .Net Framework 1.0 SP 3, you could start getting random application crashes if you use ToolTip.RemoveAll. The ToolTip control has had a memory leak since 1.0. To solve this, we put into the each form's close event the ToolTip.RemoveAll() statement. ToolTip.Dispose() didn't fix the memory leak. When SP 1 came out our application started randomly crashing. Sometimes it took five minutes, sometimes as long as five hours. Microsoft finally chased it down to the RemoveAll statement that had been changed. We switched to Dispose and the crashes stopped. They had also fixed Dispose so that it cleaned up the memory leak (they didn't actually fix the control leaking, just the Dispose method). This issue is now that if you don't have SP 1 installed, the ToolTip control will leak. Given the choices I would much rather have the leak than the crash!!! Tag: Big Red X on DataGrid Tag: 79101
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 - Effective exception handling I would like to know what people are using for effective exception handling in windows forms applications? I ideally want to log all exceptions raised by my application without try catch blocks in every method. The only way I can seen to do this is by subscribing to both the Application.ThreadException and the AppDomain.UnhandledException. Any suggestions on what the best way to achieve this? Many thanks DT Tag: Big Red X on DataGrid Tag: 79098
 - 19
 - Combo box controls in Windows Applications render list items blank Several of our windows applications are rendering the items created in controls like ComboBox controls as blank. The items are actually in the collection but the window that is displayed what the ComboBox is open shows all items as blank. We also noticed that a simple operation like MessageBox.Show("Hello World", "My Application") renders the "OK" as blank also (no text is displayed) and the Text property for the message being displayed (Hello World) is also blank. Is there any issue reported with the System.String class and the XP SP2? Any idea will be appreciated. Thank you in advance. Tag: Big Red X on DataGrid Tag: 79096
 - 20
 - Trapping if enter has been type For some reason my application will not recognize the enter key as a keydown event what gives??? I just want to test if the enter key has been struct in a textbox any suggestions? Thanks in Advance. Tag: Big Red X on DataGrid Tag: 79093
 - 21
 - accessing form controls in Vb.net Hi all, I have created two forms namely form1 and form2 in my application. I created a button "start" in form1. When this button is clicked form2 is initialised as a child object and an instance of form2 is displayed at the same time hiding form1 from the user. In form2 I have an "exit" button, which when clicked invokes "me.close()". This closes form2 which is active. but still the program is not stopped, Because form1 was the startup object and it is been hidden. So the hidden form1 is alive and hence the program does not stop and the user is not seeing anything on his screen.Please tell me a way to hide form1 when form2 is invoked and at the same time when form2 is closed the entire program should be closed. With smiles, Deepa. Tag: Big Red X on DataGrid Tag: 79090
 - 22
 - SizeGrip Active Area I have a number of resizable windows in my application. Some of them are displayed as modal dialogs while others are displayed as normal windows. The ones that appear as dialogs show the size grip at the bottom right corner. The active area over this size grip is a rectangle that includes the size grip as displayed. When I display a normal window, the size grip does not display. Even if I set the SizeGripStyle property to Show, the active area remains the same (just near the border). I would expect the active area to be larger as it is in the modal dialog case. Is there a way to make the active area larger when the size grip is displayed? It is confusing to see a size grip icon, move your mouse over it, and then not be able to resize the window because you are not in the active area. Thanks, Rangi Keen Tag: Big Red X on DataGrid Tag: 79077
 - 23
 - Drawing own titlebar or caption This is a multi-part message in MIME format. ------=_NextPart_000_0062_01C4B605.5C8CA770 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I want to draw my own colors into the titlebar of a Form.=20 I tried to get the WM_NCPAINT-message and drawed into a the non client = region: protected override void WndProc(ref System.Windows.Forms.Message msg) { if( (msg.Msg =3D=3D WM_NCPAINT)) { IntPtr hdc; if (msg.WParam.ToInt32() =3D=3D 1)=20 { hdc =3D GetDC(msg.HWnd); //hdc =3D GetDCEx(msg.HWnd, (IntPtr)msg.WParam, = DCX_WINDOW|DCX_INTERSECTRGN); // Paint into this DC Graphics g =3D Graphics.FromHdc(hdc); g.FillRectangle(new SolidBrush(Color.Red), -20,-20, = this.Width, this.Height);=20 ReleaseDC(msg.HWnd, hdc);msg.Result =3D (IntPtr)0; //g.Dispose(); } } else=20 { base.WndProc(ref msg); } } But this did not work. Than I found something with a borderless Form. = First creating a 1 px bigger non client area, and then paint into, but = the code example couldn't include into my project (I do not know why), = because of using of NatvieMethods. Now I really don't know anymore. I only want to use my own color for a = gradient titlebar and be indepentend of fucking windows themes and = coloring Thank you your best comments :) And please help me!! Robert. ------=_NextPart_000_0062_01C4B605.5C8CA770 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2900.2523" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV>Hi,</DIV> <DIV> </DIV> <DIV>I want to draw my own colors into the = titlebar of a=20 Form. </DIV> <DIV> </DIV> <DIV>I tried to get the WM_NCPAINT-message = and drawed=20 into a the non client region: protected override void WndProc(ref=20 System.Windows.Forms.Message msg) {     = if( (msg.Msg =3D=3D=20 WM_NCPAINT))     {         IntPtr = hdc; <FONT=20 face=3DCourier size=3D2>        if=20 (msg.WParam.ToInt32() =3D=3D 1)         {             hdc = =3D=20 GetDC(msg.HWnd);    =20         //hdc =3D GetDCEx(msg.HWnd,=20 (IntPtr)msg.WParam, DCX_WINDOW|DCX_INTERSECTRGN);             // = Paint into=20 this DC    =20         Graphics g =3D=20 Graphics.FromHdc(hdc);    =20         g.FillRectangle(new = SolidBrush(Color.Red),=20 -20,-20, this.Width, this.Height);            =20 ReleaseDC(msg.HWnd, hdc);msg.Result = =3D=20 (IntPtr)0;    =20         //g.Dispose(); <FONT=20 face=3DCourier=20 size=3D2>        } <FON= T=20 face=3DCourier size=3D2>    }     else     {         base.WndProc(ref=20 msg);     } } But this did not work. Than I found = something with a=20 borderless Form. First creating a 1 px bigger non client area, and then = paint=20 into, but the code example couldn't include into my project (I do not = know why),=20 because of using of NatvieMethods. Now I really don't know anymore. I only = want to use=20 my own color for a gradient titlebar and be indepentend of fucking = windows=20 themes and coloring Thank you your best comments :) And = please help=20 me!! Robert.  </DIV></BODY></HTML> ------=_NextPart_000_0062_01C4B605.5C8CA770-- Tag: Big Red X on DataGrid Tag: 79076
 - 24
 - mshtml and the click event inside of a windows service. I have an application that uses the Ax web browser object. When I call the IHTMLElement.click() method on an input button (<input type="submit"> or <input type="button">), the click fires appropriately, if I'm running it from a windows forms based application. However, when I run the EXACT same code under a windows service, either as a logged in user or as the local system account, the click fails to process. Clicking on other elements (like <a>) works. I've tried submitting the form directly, in cases where a submit occurs, but can't do that either. Both GET and POST actions fail. What am I doing wrong? Is there something that prohibits the onclick event from firing for buttons when running as a service? Am I missing something? Robert Tag: Big Red X on DataGrid Tag: 79074
 - 25
 - DataTable DataRow tag property?? I'm programmatically creating a DataTable like so: OccRow = OccupancyTable.NewRow OccRow.Item(0) = ObjRS("RoomName").Value Is there any way to give OccRow.Item(0) some sort of unique reference like the tag property of other controls? Tag: Big Red X on DataGrid Tag: 79072
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 - 1
 - Disable Datagrid Row Indicator Hi How to Disable the Datagird's Row Indicator (Triangle) which gets displayed on the Row header, without setting rowheadersvisible = False Thanks Bala Tag: Big Red X on DataGrid Tag: 79070
 - 2
 - Disable Datagrid Row Indicator Hi How to Disable the Datagird's Row Indicator (Triangle) which gets displayed on the Row header, without setting rowheadersvisible = False Thanks Bala Tag: Big Red X on DataGrid Tag: 79069
 - 3
 - how can my winform receive keyboard events? hi all i want my winform to receive keyboard events. however, when i add input controls to my winform (such as a button), my winform stops receiving keyboard events. how can my winform receive keyboard events? assaf Tag: Big Red X on DataGrid Tag: 79067
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 - ArgumentOutOfRangeException adding items to a CheckedListBox. Create a new form, add a CheckedListBox to it. Add the following code to the form's Load event: private void Form1_Load(object sender, System.EventArgs e) { this.checkedListBox1.BeginUpdate(); this.checkedListBox1.Sorted = true; try { this.checkedListBox1.Items.Add("ABC"); this.checkedListBox1.Items.Add("def", true); } finally { this.checkedListBox1.EndUpdate(); } } If the CheckedListBox is sorted, and you are between a BeginUpdate and EndUpdate, then an ArgumentOutOfRangeException will be thrown if you try to add an item to the list and set it's checked state at the same time. Getting rid of the BeginUpdate/EndUpdate or Sorted property "fixes" this. Tag: Big Red X on DataGrid Tag: 79066
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 - Custom datagrid I would like to create a tablelike datagrid without binding to a datasource. Is there a control for me to do this? Tag: Big Red X on DataGrid Tag: 79062
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 - How to use a custom font Hi ! I wonder how I can change the font of a .NET C# application ? I have a ".ttf", I suppose it's a TrueType font file. I will appreciate any help, if you have tutorials it will be great too. Should I copy it to Windows System folder ? Thanks in advance, Regards. Sadi. Tag: Big Red X on DataGrid Tag: 79057
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 - CalculatePageInfo: Invalid parameter used. Hi, When trying to print a document I get an Invalid parameter used exception in PrintPreviewControl.CalculatePageInfo. I m using .NET 1.1 on Windows XP machine. Regards, Pankaj Tag: Big Red X on DataGrid Tag: 79053
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 - Disable focus on webBrowser control Hi all, I dynamically load a webBrowser control on a windows form control. Every time I load the webBrowser control the focus is set to the webBrowser control. How can the focus be set to another control on the form, after the webBrowser control is loaded? Thanks Edi Tag: Big Red X on DataGrid Tag: 79050
 - 9
 - how to set application-wide keyboard handling? hi all i have a 2 winforms in my app. one is the owner of the other. i capture keyboard events for each form. can i instead tell the entire 'app' to respond to certain keys. and not have to tell each form to handle the keys. i actually have over 20 forms, so handling keys for each form would be a lot of dirty work. assaf Tag: Big Red X on DataGrid Tag: 79047
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 - Building a windows forms "spy" Hi I am about to develop a program that scans the text properties of a number of text boxes in another program and copies them to the clipboard. The software that I want to scan has no function for printing on a printer, and therefore I am building this extension to enable simple printouts. The program I am scanning is built in C#. My program should be built in C# too. I do not know the names of the textboxes, so to begin with I need to be able to get the names of the textboxes to scan. These names will probably not change, so when have gotten these names I can add them to the code. I know the name of the form (or at least the caption of the form) that the textboxes are in. I have no need for changing the properties of the textboxes either. Does anyone have some simple code that can help me getting started? Thanks Jonas Bergman Tag: Big Red X on DataGrid Tag: 79044
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 - Increate ListView row height Hi experts How can I increase individual row's height of the ListView control ? Any help would be very much appreciated. Thanks in advance. Dotnetjunky Tag: Big Red X on DataGrid Tag: 79038
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 - vc++.net exporting database i am developing a user interface prototype using windows forms in a vc++.net environment. i have a database(ms-sql) which contains the necessary data for displaying in a complex datagrid. when i create a setup file of my prototype user interface, how can i include the database along with it? i wuld want to be able to do this so that when the application is installed on an other machine, i would want the datagrid to display the data items. thanx in advance Tag: Big Red X on DataGrid Tag: 79032
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 - Question about printing Dear all, I'm new in printing in VB.NET 2003 and want to print a run-time generated form which contains line drawing shape and text. I found that PrintDocument is good for printing by code but not for entire form. Actually it is not a kind of report but label sticker so I don't think Crystal Report is my choice. Does anybody have idea on my issue? Thanks for your attention and kindly help! Regards, James Wong Tag: Big Red X on DataGrid Tag: 79030
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 - DateTimePicker - Time value? How do I stop my DateTimePickers storing a time value? I just need to insert the date part into my database but the DateTimePicker.Value property seems to be in the format ##/##/## ##:##:## Tag: Big Red X on DataGrid Tag: 79028
 - 15
 - Windows User (Human) Interface Guidelines? Apple's got this document: http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/index.html or http://tinyurl.com/vgge Is there any such guideline document targetted at gui designers on the Microsoft Windows environment(s)? Any links will be greatly appreciated! Kind regards Abdullah Tag: Big Red X on DataGrid Tag: 79027
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 - how to print form??? hi all, how can I print the form at design time as well as at runtime. In VB6 there was a option in File menu to print form and there was method of form PrintForm. How can I do the same in dot net????.. any suggesstion will be appreciated.. Ansari Tag: Big Red X on DataGrid Tag: 79025
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 - Help!!! Visual Inheritance...... Hi, I want to know if I'm doing something wrong. I'm inheriting frmChild from frmBase in Project1. frmBase is referring to its MdiParent in a function call from Form_Resize event. When I try to open the designer for the frmChild it throws an exception for this, saying "Object reference not set to an instance of an object." Why is this happening. Does that mean I cannot use any runtime instanciation in a base form? Or do I have to turn something off? Why is the code executing in the designer. If I give a message box in the base form, it pops up when I am loading the Child form!!!!! Any help is appreciated.. Thanx, Debi Tag: Big Red X on DataGrid Tag: 79021
 - 18
 - Main Menu Toolbar Icon is not coming out. I have a Main Menu coded in VB.Net, which contains a Toolbar on top. There are 10 buttons with image on the Toolbar. During design time, the image on the Toolbar button can be displayed. But, during runtime, all images on the Toolbar button cannot be displayed out. Why? Thanks. Tag: Big Red X on DataGrid Tag: 79020
 - 19
 - Why does transparency only work sometimes with 32 bit color depth? I have an application that uses transparency. My video settings are 1600x1200 and 32 bit color. I can make the main dialog transparent but other controls and child windows are not transparent, I see the colored box around my control. If I switch my color depth to 16 bit everything is fine. Why does it work on some forms but not others. I can even make my main form transparent and drop a custom control that has transparency set. The main form goes transparent but the custom control has a blue (my transparent color) box around it. Again if I switch color depth it works fine. I heard that somewhere in the .NET documentation it says transparency is not supported under 32 bit color. I have a hard time believing this. Are there any computers that don't come in 32 bit color mode anymore? Jim Tag: Big Red X on DataGrid Tag: 79008
 - 20
 - Memory leak - Forms with Owners I have created a project that has two forms. Form1 has a button which runs the following code: private void button1_Click(object sender, System.EventArgs e) { Form2 f = new Form2(); f.Owner = this; f.Show(); f.Close(); this.RemoveOwnedForm(f); f.Dispose(); f = null; } Using .NET Memory Profiler (http://www.scitech.se/memprofiler) I am able to see that Form2 is not disposed. This seems to be a huge issue. Has anyone experienced this problem? Is there a workaround? Have I done something incorrectly? If I remove the line where the Owner is set, there is no problem with Form2 being Disposed. Thanks, Nate Tag: Big Red X on DataGrid Tag: 79001
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 - Memory leak - Forms with Owners I have created a project that has two forms. Form1 has a button which runs the following code: private void button1_Click(object sender, System.EventArgs e) { Form2 f = new Form2(); f.Owner = this; f.Show(); f.Close(); this.RemoveOwnedForm(f); f.Dispose(); f = null; } Using .NET Memory Profiler (http://www.scitech.se/memprofiler) I am able to see that Form2 is not disposed. This seems to be a huge issue. Has anyone experienced this problem? Is there a workaround? Have I done something incorrectly? If I remove the line where the Owner is set, there is no problem with Form2 being Disposed. Thanks, Nate Tag: Big Red X on DataGrid Tag: 79000
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 - WM_KEYDOWN, WM_CHAR and WM_KEYUP I am using SendMessage() to send characters to a window. After using Microsoft Spy++ to look at window messages when I click a key, I noticed that the enter key sends WM_KeyDown WM_Char and WM_KeyUp but the home key only sends WM_KeyDown and WM_KeyUp. Is there some rule I can use to tell if I should send the WM_Char or not? Tag: Big Red X on DataGrid Tag: 78986
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 - exceptionless exceptions in masked edit box Hello, I encountered something to that, even though I have worked it out for myself, I thought should be passed on. While I was debugging an event handler (Validating) for a masked edit box, I suddenly found myself 'back in the UI'. The line of code that precipitated the surprise exit from the event handler to the UI happened to generate a null reference exception, but no detectable exception was reported (either in the IDE debug run or in the released program). The line of code was not in a try/catch block (there are others in the handler and, when appropriate, they are triggered). It was the true source of the bug being worked on, but it was not detected until much later in the code because as far as anyone knew the event handler validated the control quite nicely. I figure that whatever 'hidden' code calls the event handler does so from within its own try/catch block. When it encounterd this particular exception, it simply returned execution to the 'UI thread' (no explicit multi-threading was used in the program, that descriptive phrase was intended to limit verbiage (looks like I failed there)). I don't know if this is just an issue with the masked edit box or with more controls. Thought you'd like to know, mklapp Tag: Big Red X on DataGrid Tag: 78983
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 - ok to use threading in winforms for remote connections? Is it proper to use threading in winforms to retrieve data from a remote sql server? I thought about setting the timeout period in the connection string, but what would be better is to start my bind() function in a new thread so the app isn't tied up searching for the sql server. Any problems I should be aware of? -Max Tag: Big Red X on DataGrid Tag: 78982
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 - How TO DO VS.NET Resizable Tear Off MDI(s) Does any body know how to do visual studio.net style resizable tear off MDI(s)? I have played with the new splitter tool in vb.net 2005 and it is somthing like what I am trying to do but it doesn't have closing or push pen abilities. -- Think, Speak & breath Code! Tag: Big Red X on DataGrid Tag: 78980

I have a datagrid with a boolean column ? checkboxes. When the user
checks the checkboxes, the datagrid redraws with a big Red X in the
middle. This is happening only on a single computer (user), and I have
tried to reproduce the problem many times on my computer without
success. Any idea?

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Re: Big Red X on DataGrid by Lloyd

Lloyd
Wed Oct 20 22:54:22 CDT 2004

yep.
this big red X is the way WinForm handle bug in the OnPaint() method, it
catches the exception and replace the control by a dummy red cross.

what about using the debugger and break on exception?
even without VS.NET there is a free (and basic) visual debugger shipping
with .NET

"InjuredWorm" <marymunteanu@hotmail.com> wrote in message
news:85193383.0410201230.39cfd85c@posting.google.com...
>I have a datagrid with a boolean column - checkboxes. When the user
> checks the checkboxes, the datagrid redraws with a big Red X in the
> middle. This is happening only on a single computer (user), and I have
> tried to reproduce the problem many times on my computer without
> success. Any idea?

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