SelectedIndexChanged fires erroneously in OwnerDraw ListBox

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  - 1
    - 1 form listening for event in another form? i have 2 forms and i would like to make the 2nd form listen for a change in the first form. is there a way to do this? i'm already passing "this" to the 2nd forms constructor so it will update when it has focus again, but would like it to change as form1 changes. thanks in advance Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83239
  - 2
    - help panel in propertygrid Does anyone know how to adjust the size of the propertygrid's help panel programmatically? I want to increase/decrease the height of the propertygrid's help panel when I load specific objects. I have located the "Help Control" in the propertygrid's control collection and adjusted the size that way, but nothing changed. Any ideas? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83238
  - 3
    - adjusting the propertygrid's help panel Does anyone know how to adjust the size of the propertygrid's help panel programmatically? I want to increase/decrease the size of the help panel when I load a specific object into the propertygrid. I tried getting the help panel in the propertygrid's control collection and adjusting the size that way, but it did nothing. Is the size property readonly? Any ideas? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83237
  - 4
    - Worker Threads, U/I form, BeginIvoke, PostMessage like thread completion I have to think this is better than the MS article that recommends polling: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpovrAsynchronousProgrammingOverview.asp Please advise otherwise. This snippet shows how a worker thread can be set up that properly calls the parent form back. The basic jist is that an asynch delegate is used to run the worker thread, and, the worker thread in turn uses the forms BeginInvoke to effectively "PostMessage" back to the calling thread. To illustrate propogating exceptions from the worker thread to the parent form, two buttons are used. One forces an error, and the other does not. IAsyncResult iarMe, iarForm; WorkerThreadDelegate workerThreadDelegate; public delegate void WorkerThreadDelegate( int start ); private void WorkerThread( int start ) { int k = 1; System.Exception exc = null; try { for (int i = start; i < start + 1000000000; i++) { k = k + 1; } if (start > 0) { throw new System.Exception( "Hello" ); } } catch (System.Exception _exc) { exc = _exc; } iarForm = this.BeginInvoke( new ThreadFinishedHandler( ThreadFinished ), new object[] { k, exc } ); } private delegate void ThreadFinishedHandler( int k, Exception exc ); private void ThreadFinished( int k, Exception exc ) { EndInvoke( iarForm ); workerThreadDelegate.EndInvoke( iarMe ); button1.Enabled = true; button2.Enabled = true; textBox1.Text = "finished:" + k + " " + AppDomain.GetCurrentThreadId(); if (exc != null) throw exc; } private void button1_Click(object sender, System.EventArgs e) { workerThreadDelegate = new WorkerThreadDelegate( WorkerThread ); iarMe = workerThreadDelegate.BeginInvoke( 100, null, null ); button1.Enabled = false; button2.Enabled = false; } private void button2_Click(object sender, System.EventArgs e) { workerThreadDelegate = new WorkerThreadDelegate( WorkerThread ); iarMe = workerThreadDelegate.BeginInvoke( 0, null, null ); button1.Enabled = false; button2.Enabled = false; } POLLING IS EVIL! Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83236
  - 5
    - Error in Form Constructor We are hitting a problem that we can't explain and wondered if anyone has seen this before or can suggest how we can stop it happening : Form 'A' inherits from System.Windows.Forms.Form Form 'B' inherits from Form 'A'. Form C inherits from Form B. Form B (the one in the middle) has a TextBox component on it. The constructor of Form 'C' attempts to assign a string value to the 'Text' property of the TextBox. It does this after all form initialization has taken place. Occasionally (we haven't identified a definite pattern), when the code assigning the 'Text' property of the TextBox executes, it falls over with an exception 'Object variable not set to an instance of an object'. The problem definitely lies with the assignment (i.e. does not lie with the value being assigned). We've also tried Me.TextBox.Text = value and MyBase.TextBox.Text = value but still the same. We've also tried assigning values to different components (such as CheckBox.Checked = True) and the same thing happens. The component can be read; i.e. code like MsgBox(TextBox.Text) works fine. We thought we had solved the problem when discovering that if the component' s properties have anything assigned to them at design time, then this run-time issue would occur fairly frequently (but seemingly randomly). Ensuring nothing is assigned at design time (i.e. the 'Text' property or 'Checked' property is not assigned at design time) seemed to halt the issue occurring. However, now it is occurring again and we can't fix it. This does seem to be a form inheritance issue as I haven't seen it on any forms that are just inherited from System.Windows.Forms.Form. Thanks for any help, Steve Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83235
  - 6
    - Saving windows state I have an MDI application and save the states of the forms when they are closed. This works correctly if each form is closed independently but if the MDI container is closed the form states are incorrect. Basically the first form to close is shows maximized but the rest show normal. Currently I am using FormWindowsState to determine if the form is maximized on close. Is there another method? Regards, John Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83234
  - 7
    - ContainerControl and focus question Hi, I have a container control A containing a container control B containing a control C (this last one is not a container). I would like that when pressing TAB, the focus order is A then C then B then somwhere else in the form. How can I achieve that ? Thank you Herve Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83232
  - 8
    - ApplicationContext class question I have just come across the ApplicationContext class and I am wondering if it might not be a best practice to use this object for the purpose of encapsulating the logic that controls when the main form in an application is actually displayed. For example, in my app, I would like to display a login form (and maybe a splash screen) prior to actually giving the user access to the main form. Right now, I display the login form from within the load event of my main form. But, I am wondering if I could encapsulate logic to display the login form, accept the user's login credentials, authenticate the user, etc. in the ApplicationContext object, and then only display the main from after the user has been authenticated. This way, if the user is not authenticated, the main form never gets loaded and the application exits. It just seems like it would make sense to keep the logic that "oversees" the display of forms out of the main form itself. Has anyone done anything like this? Is there a design pattern for doing this? Thanks!!! Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83230
  - 9
    - MDI Child icon... HI all! I have a problem with MDI forms... I have a parent form in which I must show different child forms, but only one a a time. So when I open a new form, I check if a form is already open and if it's so, after some checks, I close it. The problem is that since I don't need to open multiple forms, I always want the child forms to be maximized. But if I set the windows status property of the child forms to Maximized and set all the icons to false, whhen I open the forms I can see the icons in the left part of the parent menu. When I click the minimize icon the child form WindowsState switch to normal, that is the user is free to move it inside the parent form, but the problem is I cannot see the maximize and minimize icons so I can't maximize it again. Is there any way to hide the icons when the child form is maximized? Or it would be good to catch the minimize event in some way and preventing it. Thank in advance Paolo Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83225
  - 10
    - Get Text from System Dialog Box How do I programatically get the text from a popup dialog box? Thanks. Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83223
  - 11
    - develop component like error provider I am developing validation component, I want to be able to expose a property on every other control in the forms. Error provider and tooltip controls are examples of what I want to develop. when you add error provider to the form, every control in the form has few additional properties realted to error provider. Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83218
  - 12
    - How to save preferences for an app? Before .NET, I used to use the registry to store app preferences. But apparently now there's some other way.. like storing the data in .xml files in \Documents and Settings\<user>\Application Data\<your app name>. Could someone point me in the direction of some info or tutorials on how to save app prefs in .NET? I found some docs on XML, but man.. it went way over my head. PS: I'm using Visual C# 2005 Express beta.. lovin' it. Can't wait for its release later this year Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83215
  - 13
    - WebBrowser in MDI form messes with other controls focus Hi All, If I place a com "wrapped" WebBrowser control on a form - it works fine if NOT and MDI child. If it is an MDI child, then the other controls (text boxes for example) - will not take mouse input correctly, etc. I researched and found a fix to call form.Activate() if WM_MOUSEACTIVATE is called - but it did not work. I also found a fix to additionally subclass the WebBrowser to call Focus() - which did not work. If you switch to a different MDI child, and then switch back - everything then works correctly. If you switch to a different application, and then switch back - everything then works correctly. This is very frustrating - I have not found any useful info so far. - Again - the Activate() on WM_MOUSEACTIVATE does not work Thanks in advance for any help. Tom Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83211
  - 14
    - how to expand and collapse rows in DataGrid to create parent/child Hello al, I am new to Windows Forms and for the past week or so, I have been pulling my hair out, trying to figure out how I can implement expand/collapse in the DataGrid. I do understand that if I setup relations between two tables in a dataset, and then assign the primary table to the DataGrid, I get the +/- buttons and I can expand and collapse, but this is NOT what I want. I don't have two tables. I have 1 table, where there are rows of data, some of which are childern of other rows. This is indicated by a colum in each row, which has the ID of the parent row. There is a really good example of what I want to do here: http://www.codeproject.com/aspnet/HierDataGrid.asp Basically, this person (in the link above) has implemented EXACTLY what I want to do, by adding a colum with the +/- buttons, and then hiding all rows that are NOT supposed to be displayed and displaying those what ARE supposed to be displayed, using the Visible property of the row in the datagrid (setting it to true/false as needed). I have looked all over the internet to try and find out how to do this in Windows Forms DataGrid, have had no luck so far. Your help would be GREATLY appreciated. Cheers, -farshad Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83210
  - 15
    - Interface design Hello, I am writing a Windows Forms application for users with a variety of screen resolution settings (800 x 600, 1024 x 768, etc.) What is the best (fastest) way to design an interface in which the controls will be positioned in an appropriate scale regardless of the screen resolution? I started declaring all the controls in my code and setting size properties, and testing logic to determine where the controls should be positioned, but Iâ??m thinking there has to be a better way. Thanks in advance for your help! Gary Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83209
  - 16
    - Displaying word doc in .NET/Windows Forms Can anyone let me know if it is possible to display a Word doc in a Windows Form? If yes please let know me where I can find information on how to implement that functionality. Thanks in advance. Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83207
  - 17
    - How to display application build time at runtime? I am using VS.NET 2003 and C# to develop a Windows Forms application targeted at Windows XP. I would like to automatically capture the build time and date such that it can be displayed by the application, for example as part of the About form. Is there a way to configure VS.NET to capture this information and place it in a variable or resource file such that it is available at runtime after distribution? Thanks, Dave Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83204
  - 18
    - How to get embedded resources from any namespace in project? How can I load embedded resources from any namespace in my WinForm project? For example, a namespace such as "MyApp.UI.Views"? I have a Resources\Images\ folder in my main project containing embedded resources. To load an icon from my main form using the "MyApp" namespace, I use: myIcon = new Icon(this, "Resources.Images.FolderClosed.ico"); Thanks in advance for any tips or suggestions, -Ed Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83203
  - 19
    - Asychronous events and rendering contexts Hopefully this is the right newsgroup. I figured you guys would be the best experts on this. I am learning C# and .NET and went a little crazy with the events. Now I am not sure how to isolate this problem. Here is my architecture, I have: 1. an OpenGLPanel class derived from UserControl that handles the repainting using OpenGL. A render event is published for subscribers to paint into the window. 2. a Manipulator class that handles mouse and keyboard events to cause rotations, scales, etc. using events. 3. a Camera class that rotates, zooms, etc. based on any subscriptions to a Manipulator and posts view update events. Okay, simple scenario, I have a form with two OpenGLPanels, visible. Each has a camera and listens for the camera events. The camera listen for the manipulator events. The manipulator listen's for the form's mouse and keyboard events (a complete cycle!!!!!). The main form has a method to draw an object and subscribes to the OpenGLPanel's render event. Things work great in a serial world. I even could attach a manipulator to both cameras, etc. Pretty cool!! I was just started to really like this new environment. I decided to switch from just firing the event to doing an asynchronous call (as a first step to remoting the camera). I would really like a OneWay approach for the camera, but both of these destroy the OpenGL context or something. Right now, I am only processing the camera updates to the OpenGLPanel's asynchronously, but would suspect that all of the mouse events are also handles asynchronously. The render events will always be sequential, but I would also like to have the manipulator events happen OneWay to the cameras. The problem with the render made sense to me at first, if I set the active rendering context and then the thread got bumped, etc. I added [Synchronization] in front of the OpenGLPanel class. It and the Form1 class are the only ones that make OpenGL calls. I get one of the Panels not redrawing. The calls are all happening, but I think something in the state got messed up. The other panel starts off blank and then when I force a particular event (set of events) it shows up and works properly. Changing the subscription order seems to reverse which panel works and which one does not. Pretty much every method is atomic and nothing is left in a bad state (if I programmed it correctly). I decided to add [Synchronization] before all of my classes, but nothing helps. BTW, I never create any threads, just those (two) from a default Windows form. I am running on a single CPU machine. Okay, now for the question(s): 1) Is this a correct way to protect a shared system resource? 2) Is there a better way? 3) Any guesses on what might be going on before I attempt to boil the code down to a simpler test case (or assugn it as a midterm question :-) )? 4) I can see the High priority thread preempting the other thread, such that mouse calls are continually triggered before any updates to the display can finish. I would expect, that after I release the mouse and wait idle for awhile the display would redraw. Some other questions on multi-tasking: 4) My counter indicates I am still getting 70-90 frames-per-second, but visually, it is more like 1-2 fps. 5) Are the events queued, or do I always just get the most recent event? If they are queued, is there an easy way to only get the latest. I want to display with the latest camera, not march thru all of the events. 6) How does a Windows form split up its tasks into threads? I know you want the user interface thread to be at a high priority, is everything in the form then issued at a low priority? This would include control updates and displays, so ... This is all educational code for my own amusement, so I happy to give the entire project to anyone interested in looking into this further. Roger Crawfis Associate Professor Computer Science and Engineering Dept. The Ohio State University Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83200
  - 20
    - Good Practice on ListBox Greetings I want to display a listbox on the form which will include two columns from the data table" FirstName" & "LastName" What I've done now, is modify the DataAdapter to include two additional colums as: [FirstName] + " " +[LastName] As NameFN [LastName] + " " +[FirstName] AS NameLN I've selected NameFN as the DisplayMember of the listbox However, I've also selected the Sort option to be true So what I see on the listbox doesn't correspond to the record selected on the form. The record is selected automatically on the form because my DataSource Property is bound to the dataset object. Is this a good practice ? Or its better to create a dynamic Array List on loadup and use that ? If that is the case how can I make the list selection, make the record on the form change ? Thanks Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83198
  - 21
    - Problem positioning controls within a panel with autoscroll=true I don't know if this is a bug or if I am doing something wrong, but hopefully somebody could help me. I have a panel with autoscroll=true, and I am trying to position controls within it, however they don't position correctly. According to MS's documentation Panel.Left "Gets or sets the distance, in pixels, between the left edge of the control and the left edge of its container's client area." Here's the sample code for you to reconstruct it real quick. Essentially its a form with a panel with autoscroll=true, a textbox of any size outside of the panel, and a button with the following click event handler. int x = 0; int y = 0; private void button1_Click(object sender, System.EventArgs e) { TextBox f = new TextBox(); f.Size = textBox1.Size; f.Multiline = true; panel1.Controls.Add(f); f.Left = x1; f.Top = y1; //f.Location = new Point(x1, y1); x1 += 100; y1 += 100; panel1.Refresh(); } It should draw textboxes diagonally toward the right, with a scrollbar eventually appearing. However, if you move the horiz/vert. scrollbars any bit after creating a few of these diagonal boxes, it jumps a huge gap, then creates the textbox. What I think should be happening is that it should create a lot of textboxes diagonally with no gaps between them regardless of whether or not the scrollbars have been moved at all. I have tried using the commented out location line above and I have tried setting the positions before adding it into the panel. Nothing has worked for me so far. Thanks Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83195
  - 22
    - Button shortcut not working In VB6, I could use & to assign a shortcut in the button, but it doesn't seem to work in .NET. Does anyone know how to make it work in .NET? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83190
  - 23
    - ListView Scrollable LS, Is it possible to scroll the listview with the property ScrollAble = false; Thanx in advance Joey Chömpff Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83189
  - 24
    - article ID: 838534 - Form icons are displayed as generic code modu Form icons are displayed as generic code module icons in the Visual Studio .NET 2003 IDE. It is not possible to download the files. Somebody in Microsoft can sand me them? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83188
  - 25
    - Questions regarding hidding vs closing forms I have a few questions regarding hidding vs closing forms. Is it bad practice to close the current form when openning a new form? Does it create a lot performance and memory issues? Is it better to use the Hide method instead? And if I use the Hide method, is it true that I have to create global variables for these forms, so that I could Show the hidden form from another form? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83182
- Next
  - 1
    - Problem/Bug: poor C# windows forms accessibility for disabled? Hi, Because the blind are unable to use a mouse, keyboard navigation is key. A major difficulty is that not all windows forms controls are keyboard 'tab-able' or 'arrow-able' or have "tab order". The application is built and the next step is to create the custom JAWS (Freedom Scientific)screen reader script to read the application. The application uses the accessibility properties for controls provided by C#. JAWS reads properties these fine --using a mouse for access. For example, JAWS can read ComboBoxes and DateTimePickers that are placed into DataGrid cells without any problem. The problem is the lack of keyboard access. Using Microsoft's accessibility SDK 2.0 tools: AccExplorer32, Inspect32, AccEvent32, I can gather a great deal of information. It appears that C# controls can not be given individual unique IDs. JAWS can navigate to IDs. Is there something that can act like a unique identifier? Different classes/objects are simply labeled WindowsForms10.Window.8.app3. This is too ambiguous. JAWS has a limited number of recognized classes it understands, but a substitution could be made if an unknown class was unique. What about custom controls? Is there a way to uniquely ID C# custom controls? There are many very interesting controls being developed in the .NET world, that could be read if there where more identifiers. Looking for help at MSDN and the Knowledge Base it seems that there is a significant difference between C# and C/C++ functionality in this context. How can I have keyboard access to my C# windows forms application? Can anyone offer any tips, or code samples? Thanks, Walt My environment: C#, Windows Forms, Framework 1.1, VS.NET 2003, Windows 2000 & XP, JAWS 5.0 Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83181
  - 2
    - Embedded Control in IE, control loads but get System.Security.Permissions.SecurityPermission request error in IE... Hello, I have been posting lately on my embbeded control. I have made some progress. My control is strong names, with allow partially trusted callers attribute. I have created a custom code group with full trust for my assembly. Before, my control would not load at all due to security issues. I would get exceptions outputed into my IEDebug log. Now i get no errors in my IEDebug log but in Internet Explorer (Exclamation mark at the bottom left of IE), I get an error: Request for the permission of type System.Security.Permissions.SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed. I do not even know where to begin if I need to assert. What calls would require me to Assert a SecurityPermission?? Thanks, Marco Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83180
  - 3
    - ExceptionManagement Application Block strange behavior I am seeing a strange bug when using the Exception Managament Application Block with a No Touch Deployed WinFroms application. Who can I contact at MS on this? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83174
  - 4
    - call a button's click event from another procedure Hello, Is it possible to call a button's click event from another procedure? If so, what needs to be supplied as the Object , and SysEventArgs parameters for the click procedure? Thanks. Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83172
  - 5
    - Forms with no title bar - Microsoft Money 2005 Hello folks. IÂ´d like to build a application with the same look and feel of the Microsoft Money 2005. As you can see, the first screen is maximized with the control buttons (minimize, maximize, close window) but the title bar, of the window, is not showing blue, as Windows standard, itÂ´s showing a part of a background image, giving to the user the sensation that it has no form title. How can I do that in C#? Is it possible to do that? Do you have a sample? Thanks a lot Henrique Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83171
  - 6
    - HELP! - MessageBox in FullScreen app Is it possible to show a messagebox within an application running in full-screen mode? .Net does not seem to like this concept at all, as it is impossible to bring the messagebox to the front, even if I implement it as a form in its own right. Help! Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83170
  - 7
    - Drag an Drop in MDI child forms Hi, I have to Drag an Drop data between 2 listviews in MDI child forms. How do I activate the target child form, if the mouse is over. Tia Torsten Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83168
  - 8
    - Array of Class Hi, I must design a method that receive a Control object and return a single value if it is a TextBox object, another value if it is a ComboBox object and so on. If I try a "if-else-if" loop, this will be very unhappy! Can I use a foreach to make that? How declare and create the array for use in the operator "is" (for test a Control, like "cont is TextBox")? Thanks, Max Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83166
  - 9
    - Current record of datatable in dataset Hi I have a datatable which I have linked to a combo control, via the datasource property of the combo control. I have also set the displaymember property of the combo, to ensure that my description is shown in the combo. However, I want to have another value of the same row of the datatable (as selected in the combo), displayed in a text box. ie. so that when I change the value in the combo, a text box displays a value from another field in the same datarow. Can anyone offer any tips, or code samples? Thanks Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83164
  - 10
    - Creating a dynamic grid Hello, I have a question about creating a dynamic grid layout. The grid should have the following: - a rowheader(12 columns). (0) - a detail row with also 12 columns (contains the data). (1) - a second row with 3 columns where the first column is empty, the second column has a description in it like the rowheader above and a third column with the value of this row. (2) - a third row which has the same layout as the second row. (3) row (1), (2) and (3) should be created multiple times depending on the data. Is this possible to create this within C#. At the moment I draw this "grid" with seperate labels. I do this when I retrive the data for it. The data can change when clicking an other row in a different grid. My "label-grid" works fine but it is to slow when redrawing it when selecting other data because the labels must be removed from the form and created again within the code. I have also a screenprint how it must look but can not attach this. Thanks Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83163
  - 11
    - Howto trigger validation of a form Hello The ContainerControl.Validate() method is documented to: "Validates the last invalidated control and its ancestors up through, but not including, the current control." How to I, from a form (more precisly a base form) trigger the validation of the form itself. I want to ensure that the Validation events is triggered and all values transferred (trough databinding) before I peform a Save operation, however, calling the Validate() method does not cause the validation events to be triggered on the form itself. But it does case all data to be transferred for the controls on the form. Regards, TEK Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83162
  - 12
    - Problem with indexed pixel format/ I know alot of people have the problem with indexed pixel format. I hope someone can show me the solution to this.I am have problem with graphics with the following code giving the error: "A Graphics object cannot be created from an image that has an indexed pixel format." 'My code <%@ Page Language="vb" %> <%@ import namespace="system.drawing" %> <%@ import namespace="system.drawing.imaging" %> <%@ import namespace="system.drawing.drawing2d" %> <% ' initialise the web object Dim webC As New System.Net.WebClient() ' set the URL Dim strFilename as string strFilename="http://www.domain.com/graph.gif" ' create a bitmap based on the image from the URL Dim g = New System.Drawing.Bitmap(webC.OpenRead(strFilename)) response.contenttype="image/gif" dim gr as graphics = graphics.fromimage(g) ' create a New graphic object from the above bmp gr.smoothingMode = smoothingMode.antiAlias ' antialias objects '' draw the number on the image canvas in verdana 10pt font bold gr.drawString("ABC", New font("verdana",14,fontstyle.bold),systembrushes.windowtext, New pointF(2,2)) ' send the image to the viewer g.save(response.outputstream, g.rawformat) ' tidy up g.dispose() gr.dispose() webC = Nothing %> Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83155
  - 13
    - Remove datagrid scrollbars I have a datagrid on which I want to completely remove the scrollbars. At present I'm just deriving a DataGridNoScrollBar class... Public Class DataGridNoScrollBar Inherits DataGrid Public Sub New() Me.HorizScrollBar.Height = 0 Me.VertScrollBar.Width = 0 End Sub End Class Am I missing something or is this the best way? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83151
  - 14
    - Docked panels and Z-order problem. Hallo=2E I have two panels docked on the right of the form (p1 on the left= and p2 on the right) and I want third panel to slide from right= to left into a view between p1 and p2 (Just like Solution= Explorer window in Visual Studio ? if it is in auto hide mode= its slides to left when mouse is over it), but when I put my= third panel on Controls list of the form, set it child index= between those two and start to slide I have opposite effect ?= the p1 is visible and p2 is hidden ? it is a way to do this= right ??? -------------------------------- From: Dominik Jeske ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>XoRs7wjAy0C1fCkdrWtVmA=3D=3D</Id> Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83150
  - 15
    - Problem with Z-ordering !!! Hallo !! I have two panels docked on the right of the Form (z order index= p1: 0, p2: 1) and I want to third panel slide from the right= between those two panels (just like in Visual studio when you= put mouse over autohided SolutionExplorer its slides to view)= but because of z-ordering when I put my control on the form and= set his ChildIndex between those two I have opposite effect ? p2= is hided and p1 is visible ? any idea how to do this right ?= ????????? -------------------------------- From: Dominik Jeske ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>XdApU3lP3UWOFieLdyEK1g=3D=3D</Id> Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83149
  - 16
    - Form transparency issues Recently I wanted to create a small little program that could sit= on the desktop and not block the desktop wallpaper=2E There are= two methods to accomplish this ( that I am aware of )=2E 1) create a solid color bmp as a background image and set the= transparency key to match its color 2) specify the form's background color with a matching= transparency key Now my issues with both methods, but first it should be known= that I have set the forms to have no border or title bar and= have implemented code that allows me to click-and-hold anywhere= ( with exceptions listed below ) on the form and move it=2E The= data actually displayed on the form is just text and one= rectangle, all drawn by me ( there are no controls on the form= itself )=2E 1) I have two issues with this method, although it is what I'm= prefering to use at the moment=2E The first seems to be the= discrepancy between how the program is handled when the= computer's Color Depth is 32bit or when it is less than 32bit (= 16bit )=2E When the color depth is 32bit then I am able to click= on the entire area the form inhabits ( even that which is= transparent ) and move it, but if the color depth is less than= 32bit ( 16bit ) then only the drawn text or rectangle outline (= since it has no fill ) can be clicked to drag the program= around=2E Clicking on the transparent areas just passes the click= through the form to whatever is below ( even when I know the= form has focus )=2E I'd like to be able, regardless of the= desktop's color depth, to click anywhere within the form area= and move the application=2E The second issue I have with this method occurs when I take my= executable and put it on another PC ( my PC is XP Pro, the other= PC is XP Home=2E=2E Both SP2 )=2E The problem is similar, but a= little different=2E When the 2nd PC's color depth is at 32bit,= the transparency does not work=2E The green/lime ( that's the= transparent color I'm using ) background shows=2E Needless to say= this is not acceptable=2E When I change the color depth to less= than 32bit ( 24bit this time ), the transparency actually works,= but I come across the same issue of clicks on the transparent= areas just passing through=2E 2) With this method I have not tried it on a 2nd PC yet ( I don't= have it available where I am atm )=2E Its basically the same= "issue" as mentioned above with color depth less than 32bit,= except it does it with a color depth of 32bit and 16bit=2E Clicks= on the transparent areas just pass right through=2E I'm tempted= to just go with this method and possibly make one area on the= form that is meant to be used to drag it around ( similar to the= idea of the box that appears to move tables in MS Word ), but= I'm hoping there's a solution I'm unaware of before I do that=2E Anyways, all of this brings up some interesting questions=2E -What does color depth have to do with transparency handling? -Does the version of XP ( Home or Pro ) handle transparency= differently? Probably some more questions also=2E Not sure if it matters, but I'm doing all of this in C#=2E So any ideas to get pass any of these issues? Thanks in advance=2E -------------------------------- From: othell m=2E ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>HN0Y7xO4H0+DVomkdJq1vA=3D=3D</Id> Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83148
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    - Newbie: Using forms VB vs VB.Net All my experience is in VB5/6 and I am now learning VB.Net. I have a sophmoric question about proper use of forms. In VB5/6 I designed a form and to use it from a menu item I simply did the following myForm.show vbModal unload myForm In the form, my exit button would simply do the following unload me What would the equivalent code look like in .Net? Do I still need to do an unload or will it unload when the menu subroutine ends due to scoping? How should my form terminate and return to the menu sub-routine? etc. TIA John Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83147
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    - c# listbox onselect is that there is no onselect for listbox in c#? if i want to trigger an event when i select an item in the listbox what can i do? thanks a lot!!! Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83141
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    - How to implement an notification window like "MSN messenger friends online notification" Hi, I'm developing a notification application using winform. It is shown as a tray icon when running, and when a message arrive (such as new mail alert), it should pop up a notification window in the right-bottom of the desktop, just like msn messenger's friends online notification. Anybody can tell me how to implement this? Some sample code or reference document will be much appreciated! Regards, William Li Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83139
  - 21
    - Embedded WinForm Control in IE crashes... Hello, I have a WinForm control embedded in IE that crashes everytime I close my browser. If i click on a link in IE when the control is loaded and brings me to another page, IE also crashes. I don't get any debug errors from IE itself (via IEDebug). Does anyone have any idea why this would happen? As a standalone App, my control works fine. Is IE treating my control any differently? Thank you in advance, Marco Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83138
  - 22
    - Intercepting text a RichEdit/Textbox control in another application? Hi, Anyone know how to intercept the messages/text to a textbox control in another application using .Net? I know that Spy++ can do this, how is this accomplished? Been trying to avoid using global hooks to do this, but i don't know of any other way. As a workaround, I've been able to use the SendMessage with WM_GETTEXT to poll the control on a timer to retrieve the text, but ideally I'd like to intercept the messages to the textbox instead, if at all possible. Any advice? Thanks, kc Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83137
  - 23
    - User Control binding Hi, i´ve created a user control that contains a TextBox and a Label, lets call this control CText. CText has properties like Value and Text, where Text is used to display formatted Value. Well, i´m trying to create a new databind using: cText1.DataBindings.Add("Value", wDataTable ,"TableField1" ); _CM = (CurrencyManager) this.BindingContext[wDataTable ]; _CM.AddNew() ; Then, when submitting the form (winform), i call _CM.EndCurrentEdit(); ...where it is supposed that the bindingcontext datasource should be updated..., but this is not working as expected. -> Tried the same with a TextBox and it works.... -> MSDN : You can simple-bind to any object that derives from the System.Windows.Forms.Control class...., and UserControl does, so what´s the problem?? any suggestion? ErickG Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83135
  - 24
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  - 25
    - Hiding non-databound hyperlinks in a DataGrid I am brand new to ASP.NET and am now required to take over maintenance of a .NET/C# web application. On one of the pages I'm working on there is a DataGrid which has multiple columns. One of the columns is not databound and instead has up to three hyperlinks in it (Edit, Award, and Cancel). A couple of the hyperlinks should not be shown in certain cases. Now, mind you, I don't know if it's being done in the way that's best to do it. It looks like there is a "panel" being created to contain the hyperlinks that may not be visible. I don't know why though (i.e. why not just set hyperlink's Visible property and be done with it without a panel?). That being said, I want to change the page so that one of the hyperlinks does not show (i.e. Visible = False) based on a certain value for a session cookie. It's the Award link in the code shown below from the .aspx file in question. --- CODE BEGINS --- <asp:TemplateColumn HeaderText="Actions"> <ItemStyle HorizontalAlign="Center"></ItemStyle> <ItemTemplate> <asp:HyperLink id="hlEdit" runat="server" NavigateUrl='<%# "Edit.aspx?id=" + DataBinder.Eval(Container, "DataItem.PersonID") %>' CssClass="link-text">  Edit </asp:HyperLink> <asp:Panel ID="Panel1" Runat="server" Visible='<%# Convert.ToBoolean(Convert.ToInt32(Request.Cookies["core"]["sl"]) <= 9)%>'> <asp:HyperLink id=hlBids runat="server" Visible='<%# Convert.ToBoolean(Convert.ToInt32(Request.Cookies["core"]["sl"]) <= 9)%>' NavigateUrl='<%# "Award.aspx?id=" + DataBinder.Eval(Container, "DataItem.PersonID") %>' CssClass="link-text"> Award </asp:HyperLink> </asp:Panel> <asp:Panel ID="panAction" Runat="server" Visible='<%# Convert.ToBoolean(DataBinder.Eval(Container, "DataItem.PersonStatusCancel"))%>'> <asp:HyperLink id="hlCancel" runat="server" NavigateUrl='<%# "Cancel.aspx?id=" + DataBinder.Eval(Container, "DataItem.PersonID") + "&op=cancel" %>' Visible='<%# Convert.ToBoolean(DataBinder.Eval(Container, "DataItem.PersonStatusCancel"))%>' CssClass="link-text" > Cancel </asp:HyperLink> </asp:Panel> </ItemTemplate> </asp:TemplateColumn> --- CODE ENDS --- Now, the value of the cookie, when I bring up this page, is 1, which satisfies the condition...yet, the link still shows. I guess my question is two-part: 1) What is the best way to accomplish something like this? Do I have to use a DataList instead or can it be done using a DataGrid? 2) If this is best way to do it, then what's wrong with code above? Tag: SelectedIndexChanged fires erroneously in OwnerDraw ListBox Tag: 83128

I have a listbox with the DrawMode set to OwnerDrawVariable.

If the listbox is half full, and I click inside the listbox but not
directly on an item, the SelectedIndexChanged event fires. The selected
index is Count-1. NOTE: This behavior is not seen with OwnerDrawFixed
or Fixed.

Anyone know a workaround?

Thanks for your help!

Felix

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