Resize according to screen resolution ?

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  - 1
    - .NET Array/Table of Images Component Just recently started to program WinForms using C# after coming from a Delphi background. In Delphi's core VCL there was a useful component called DrawGrid, which could be used to draw a 2D array of images on the screen. It took care of all sorts of things such as scrollbars, and selecting with the mouse, etc. I can't seem to find an equivalent component in .NET. Does anyone know if such a component exists? Many thanks JD Tag: Resize according to screen resolution ? Tag: 72801
  - 2
    - RegexAssembly?_0.dll and Zero-touch deployment Hello all, I am in the process of developing a Windows Forms application that is distributed via zero-touch. Unfortunately I have come across an obstacle! A 3rd party control that I am using seems to dynamically create an assembly. When I run the .EXE locally on the development PC it is fine, if I also copy all the files to the test PC it runs fine. But when I run it via http://myIIS/ztd/app/ztd.exe from the test pc it fails and the cordbg displays the following: Microsoft (R) Common Language Runtime Test Debugger Shell Version 1.0.3705.0 Copyright (C) Microsoft Corporation 1998-2001. All rights reserved. (cordbg) a 0x4d0 Process 1232/0x4d0 created. Warning: couldn't load symbols for c:\winnt\microsoft.net\framework\v1.1.4322\ms corlib.dll Warning: couldn't load symbols for C:\WINNT\Microsoft.NET\Framework\v1.1.4322\IE Exec.exe Warning: couldn't load symbols for c:\winnt\assembly\gac\ieexecremote\1.0.5000.0 __b03f5f7f11d50a3a\ieexecremote.dll Warning: couldn't load symbols for c:\winnt\assembly\gac\system\1.0.5000.0__b77a 5c561934e089\system.dll Warning: couldn't load symbols for c:\winnt\assembly\gac\system.drawing\1.0.5000 .0__b03f5f7f11d50a3a\system.drawing.dll Warning: couldn't load symbols for c:\winnt\microsoft.net\framework\v1.1.4322\ms corlib.dll Warning: couldn't load symbols for c:\winnt\assembly\gac\system\1.0.5000.0__b77a 5c561934e089\system.dll Warning: couldn't load symbols for c:\winnt\assembly\gac\system.drawing\1.0.5000 .0__b03f5f7f11d50a3a\system.drawing.dll Warning: couldn't load symbols for c:\winnt\assembly\gac\ieexecremote\1.0.5000.0 __b03f5f7f11d50a3a\ieexecremote.dll Warning: couldn't load symbols for c:\documents and settings\swadmin\local setti ngs\application data\assembly\dl2\djzlwazx.1tk\x1r91ey8.dqq\bc19fa57\00171d2b_d6 4ac401\ztdlauncher.exe Warning: couldn't load symbols for c:\documents and settings\swadmin\local setti ngs\application data\assembly\dl2\djzlwazx.1tk\x1r91ey8.dqq\90c3c914\00171d2b_d6 4ac401\ztd2.dll Warning: couldn't load symbols for c:\winnt\assembly\gac\system.windows.forms\1. 0.5000.0__b77a5c561934e089\system.windows.forms.dll [thread 0x480] Thread created. Unable to determine existence of prolog, if any [thread 0x48c] Thread created. [thread 0x358] Thread created. [thread 0x480] Unhandled exception generated: (0x04aac748) <System.Security.Secu rityException> permissionType=<null> permissionState=(0x04ab7af8) "<IPermission class="System.Security.Permissions. SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToke n=b77a5c561934e089" version="1" Flags="ControlAppDomain"/> " grantedSet=<null> refusedSet=<null> _className=(0x04aad6ec) "System.Security.SecurityException" _exceptionMethod=<null> _exceptionMethodString=(0x04ab479c) "8 CheckTokenBasedSetHelper mscorlib, Vers ion=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 System.Security .CodeAccessSecurityEngine Void CheckTokenBasedSetHelper(Boolean, System.Security .Util.TokenBasedSet, System.Security.Util.TokenBasedSet, System.Security.Util.To kenBasedSet)" _message=(0x04aaeac0) "Request for the permission of type System.Security.Perm issions.SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, Publi cKeyToken=b77a5c561934e089 failed." _innerException=<null> _helpURL=<null> _stackTrace=(0x04ab8a3c) array with dims=[12] _stackTraceString=<null> _remoteStackTraceString=<null> _remoteStackIndex=0x00000000 _HResult=0x8013150a _source=(0x04ab6804) "mscorlib" _xptrs=0x00000000 _xcode=0x00000000 [05f5] int 3 (cordbg) I hope someone can help! Regards, Alan Seunarayan Tag: Resize according to screen resolution ? Tag: 72797
  - 3
    - Changing form's border color Is it possible to programmatically assign different colors to each form within the same project? I am using VB.NET TIA J Justin Tag: Resize according to screen resolution ? Tag: 72796
  - 4
    - How to modify the ControlBox(system menu) of a Form? I want to add some menu items to the ControlBox/System menu of a Form. Is it possible to get an instance of ControlBox and handle the events from it in managed code? Thanks. Tag: Resize according to screen resolution ? Tag: 72794
  - 5
    - dashboard/webparts winforms We are looking for a container component or a sample project that we can use to create a winform that will act like a dashboard type of screen where the users can customize their screen with different parts (similar to webparts in sharepoint services, or the Microsoft Money home page) Any idea that could save us development time will be appreciated Thanks MC Tag: Resize according to screen resolution ? Tag: 72791
  - 6
    - HashTable Question I tried to declare a HasTable in my sub and get "Type Expected" error. What am I doing wrong. Dim ht as New HasTable Tag: Resize according to screen resolution ? Tag: 72786
  - 7
    - DataGrid question Is it possible to make a single cell with its contents be in red color while the rest of the datagrid is of normal color. If so how? Thanks in advance Will Tag: Resize according to screen resolution ? Tag: 72785
  - 8
    - Possible Help Provider bug! Hi! I have a strange problem with connecting help file to windows forms. I am using the helpprovider and attaching the help in the usual way via designer. I have another popup form and whenever I open that form, the help stops working. So, after I start my application and open the popup form, and close it, then if I press F1 on the main form, the help does not come up (seems like the cursor changes to busy momnetarily and then dies). However, if I open the help file once before opening the popup form, everything works fine (even after the popup closes). I am using COM interop on the popup form (that may be screwing it up...) Any ideas...? here is the code on the main form. private System.Windows.Forms.HelpProvider helpProvider1; this.helpProvider1 = new System.Windows.Forms.HelpProvider(); this.helpProvider1.HelpNamespace = "../Help/octogo.chm"; this.helpProvider1.SetHelpKeyword(this, "Emailpasswd.htm"); this.helpProvider1.SetHelpNavigator(this, System.Windows.Forms.HelpNavigator.Topic); this.helpProvider1.SetShowHelp(this, true); Help.ShowHelp(this, helpProvider1.HelpNamespace, HelpNavigator.Topic, this.helpProvider1.GetHelpKeyword(this)); Thanks for any pointers Tag: Resize according to screen resolution ? Tag: 72781
  - 9
    - calling methods in a running windows service Is it possible to create a Windows Service that will allow .NET applications to call it's methods and get returned values? If so, how is it done? Tag: Resize according to screen resolution ? Tag: 72780
  - 10
    - Text margins in a control I'm finding some odd results trying to use exact margins in a control. I'm using Tahoma 8.25pt bold font. I need the text to start exactly 5 pixels from the left-hand edge of the control. When using the Graphics.DrawString method, I have to pass a left edge of 3 in the rectangle for the text to begin 5 pixels from the left edge. Since it's 0 based, a value of 3 works out to 4 pixels. A value of 0 passed into the rectangle leaves a 1 pixel margin. What if I wanted my text flush against the edge, though? Where is the extra pixel coming from? Thanks. Pete Tag: Resize according to screen resolution ? Tag: 72775
  - 11
    - How does Usercontrol make reference to it's container form and other Usercontrols? Can anyone give me an example of how a 2 Usercontrols sitting on a single container Winform can make reference to each others properties and methods and those of the parent form that they are contained within? Tag: Resize according to screen resolution ? Tag: 72770
  - 12
    - resource icons Hi I've just created my first application that registers an icon in the taskbar. In the process I noted that my icon doesn't show up as external file in the project, it seems to be registered as a resource somehow. Now I'm wondering if I could add additional icons so that I don't have to deliver them with the executable, but since I don't know how the first icon belonging to the NotifyIcon has been added, there's no way I can duplicate that process without adding another NotifyIcon. Any ideas? Regards Stephan Tag: Resize according to screen resolution ? Tag: 72768
  - 13
    - No touch deployment, load unmanaged dll Hi, I have windows form application that uses unmanaged c library. When I am using no touch deployment, I am trying to load this dll from url that this application came from. for example http://Myserver/Depl0y/analytic.dll I am geeting exception File not found. When I am trying to access manually through web browser, I am getting the dll to download. Securty group on client machine has fulltrust. Is it possible to do? Thank you. Tag: Resize according to screen resolution ? Tag: 72766
  - 14
    - ICustomTypeDescriptor.GetProperties I want to implement a class derived from ICustomTypeDescriptor. My current implementation of the overloaded GetProperties methods look like this: public PropertyDescriptorCollection GetProperties(Attribute[] attributes) { PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(m_thing_with_properties,attributes,true); return hack_property_display_names(properties); } PropertyDescriptorCollection System.ComponentModel.ICustomTypeDescriptor.GetProperties() { PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(m_thing_with_properties,true); return hack_property_display_names(properties); } where "hack_property_display_names" is a private method that alters the PropertyDescriptorCollection. My problem with this implementation is that I'm not cacheing/controlling the PropertyDescriptorCollection. I would like to: * Construct my PropertyDescriptorCollection in my constructor and save it as private member data * Change the GetProperties() methods to return thhis private data. My problem with doing this is that I don't understand the "Attribute[] attributes" parameter. The help says only that it acts as a filter. If I have a PropertyDescriptorCollection, what does it mean to (or, how do I) apply a "Attribute[] attributes" filter to it? Tag: Resize according to screen resolution ? Tag: 72764
  - 15
    - .NET Application Updater Component: how to handle an OCX? Hi, I have an VB.NET application that uses an OCX for some control. I integrated the application with the .NET Application Updater Component (http://windowsforms.net/articles/appupdater.aspx) to copy automaticly new versions of the application to the clients. The problem is: it copies the OCX, but the OCX isn't registered. Everything works fine until the the directory of the old version is deleted: The application doesn't find anymore a registered ocx, and therefore throws an error. Is there anyway how I could work aroudn this problem? Can I make it registered automaticly? Or make it in some way that it shouldn't be registered? Maybe be playing with the way I reference it in VS.NET? Or some way I can put it in my first setup so I won't have this problem with other updates? Thanks a lot in advance, Pieter Tag: Resize according to screen resolution ? Tag: 72761
  - 16
    - VB.Net Mdichild focus problem ? Hi, I have a main menu which parent mdi form and i opening two mdi child form (frm1,frm2) with listview doubleclick event on main menu.. ex: Dim frm As New frm1 frm.MdiParent = Me frm.Show() Ok, there isn't problem But when two child forms opened, and try this forms open again , i couldn't use top code , because this code create new same form .. So i try to activate (focus) opened child form if it is loaded.. I use boolen variabel and set frm1loaded event isfrm1loaded=true when frm1 first created.. Maybe you have a better idea this problem.. So my code: If Isfrm1 = True Then frm1.ActiveForm.Focus() Else Dim frm As New frm1 frm.MdiParent = Me frm.Show() End If But frm1.ActiveForm.Focus() couldn't work..??? If this frm1 behind to frm2, it isn't come front to frm2 .. How can i ? If i use visualbasic 6 , solve tihis problem very easy But .net form management very complex and i colund't find examples in msdn.. Thanks in advance.. Note:I am from Turkey and my primitive language is Turkish.. Execuse for my english :) Tag: Resize according to screen resolution ? Tag: 72756
  - 17
    - Problems with the display of the tabs in my customized TabControl I want to change the the color of the tabs and the color of TabControl itself in a TabControl. Therefore I wrote the following code in my customized TabControl-class: this.DrawMode = TabDrawMode.OwnerDrawFixed; protected override void OnDrawItem(DrawItemEventArgs e) { e.Graphics.FillRectangle(new SolidBrush(Color.Gray), this.ClientRectangle); for(int i = 0; i < this.TabCount; i++) { Rectangle currentPage = this.GetTabRect(i); e.Graphics.FillRectangle(new SolidBrush(Color.Green), currentPage); e.Graphics.DrawString(this.TabPages[i].Text, e.Font, new SolidBrush(mTabFontColor), currentPage, StringFormat.GenericDefault); } } It changes the colors correct, but the problem is, that the tabs aren't shown correct (especially if appearence = Button is selected, than it sometimes draws a normal rectangle instead of an unselected button ). Does anybody have an idea how I could change the color of the tabs and also the color of the tabControl itself in a proper way? I know about "dotnetmagics", but I am not willed to purchase it, because I think there has to be a different way of implementing this comparative simple task. Tag: Resize according to screen resolution ? Tag: 72755
  - 18
    - NumericUpDown ignores Minimum/Maximum Everyone knows by now that the NumericUpDown control does not fire the ValueChanged event when the user has manually entered a value. However, I just discovered that manually entered values are also never restricted to the Minimum and Maximum values, not even when the user tabs away from the control! The attached sample program creates a NUD control with a value range of 1-10, and a button whose sole purpose is to allow tabbing away from the NUD control. Note that you can manually enter whatever value you want, and the value will persist even after tabbing back and forth. The only workaround that I've found is to attach a Validating event handler that cancels any change that would cause the value to leave the range defined by Minimum and Maximum. Is there some secret trick that I'm missing? Thanks... ----- C# sample code follows ----- using System; using System.Drawing; using System.Windows.Forms; public class WindowsForm: Form { public static void Main() { Application.Run(new WindowsForm()); } public WindowsForm() { NumericUpDown upDown = new NumericUpDown(); upDown.Location = new Point(10, 10); upDown.Minimum = 1m; upDown.Maximum = 10m; Controls.Add(upDown); Button button = new Button(); button.Location = new Point(upDown.Right + 10, 10); button.Text = "OK"; Controls.Add(button); } } -- http://www.kynosarges.de Tag: Resize according to screen resolution ? Tag: 72754
  - 19
    - problems displaying forms correctly Greetings I have a very simple question. I'm having some problems working with forms. On my winforms application, I have a form (main_form) that display another form that shows a listing od data. This sencond form (listing_form) is displayed with the ShowDialog(this) method (called from main_form). On this second form I have a "new item" button that displays a third form (data_form) for data input. What I want is, when the button "new item" is pressed, the form listing_form closes and the form data_form appears. So I cannot use ShowDialog(main_form) from listing_form to display the data_form because listing_form does not closes (it waits for the data_form to close). What I need is the data_form to be called/displayed from the listing_form and be modal relative to the main_form, and close the listing_form at the time the data_form is displayed. Any ideas how can I achive this? Thanks in advance Almeida Tag: Resize according to screen resolution ? Tag: 72752
  - 20
    - deleting selected row in datagrid hi i have a datagrid binded to a datatable. i want to delete the selected record in the datagrid i did something like this CurrencyManager cm = (CurrencyManager) Grid.BindingContext[CommonDataset.Tables[0]]; DataRowView row = (DataRowView) cm.Current; row.Delete(); cm.EndCurrentEdit(); DataRow[] dr=CommonDataset.Tables[0].Select(null,null,DataViewRowState.Deleted); commonAdapter.Update(dr); But somtimes the selected record is not deleted but some other record is deleted ...... Tag: Resize according to screen resolution ? Tag: 72739
  - 21
    - Focus on UI Design UI is important because it affects the feelings, the emotions, and the mood of your users. If the UI is wrong and the user feels like they can't control your software, they literally won't be happy and they'll blame it on your software. If the UI is smart and things work the way the user expected them to work, they will be cheerful as they manage to accomplish small goals. Hey! I ripped a CD! It just worked! Nice software! Wooooooooooo! Recently,I found a good UI resource software HelloUI, it collects some very good UI work. Serious recommend to you: Hello UI introduction URL http://www.qwerks.com/product.asp?ProductID=6873 Tag: Resize according to screen resolution ? Tag: 72737
  - 22
    - datagrid scrolling...capturihng rows displayed in view of datagrid I have a datagrid on a property tab sheet. Lets say that the grid contains 50 rows with 12 displaying on the first page. For this example lets say the user scrolls down to record 3 and records 3-14 display. The user clicks off to another tab and comes back. They do not select anything on the grid. I want to remember when they come back to scroll to position 3 at the top through 14 on that page. I know how to handle this if a record is selected on the grid but that is not the case in this example. I was looking at the paint method to get the rows and the scroll event but I don't know how to capture the rows displayed in the view of the grid. Is there a proper sequence of events to capture which rows are in view? Any overriden methods I should be using? Thanks for your help. Tag: Resize according to screen resolution ? Tag: 72735
  - 23
    - Inheriting forms by code, Nullreference exception I have a project which has two solutions, one for .NET on the PC and one for .NET on mobile devices, most of the code is shared between the two projects in a commmon folder, but both projects have thier own version of Form1. The problem is that there is a lot of code in Form1 that could be shared between the two projects, really the only major differences are in the windows form designer code. I recently have been trying to make a new class that inherits the project specific Form1, i have stripped out all but the Constructor and the Form designer code (declarations,initializecomponent) from form1. The new class inherits simply inherits the controls and initializecomponent from Form1. The new class contains all of my worker subs and the control events etc. The problem i am having is that when i go to access one of the controls (after the constructer and initializecomponent have been called), it gives a System.NullReference Exception "Object reference not set to an instance of an object." yet i can see the control and its properties as part of the ME reference under locals in the debugger. Any ideas on what i'm doing wrong? Cheers, Owen W. Tag: Resize according to screen resolution ? Tag: 72734
  - 24
    - Problem with ListBox I have a ListBox embedded in one of the tabs of a TabControl. I have this control bound to one of my objects. Everything works fine, until I switch to another tab, when I switch back to the ListBox all my selections are lost. I am using SelectionMode = Multiselect. What can I do to prevent this?? Thanks in advance, Daniel Tag: Resize according to screen resolution ? Tag: 72732
  - 25
    - How to clean out existing installation... This was the closest newsgroup name to the problem I am having. The application is actually a Windows Service but I think the problem I am having may be familiar to forms developers. I have installed an application with one forms project and two windows service projects that the form controlls. When I was doing a re-install this morning I got a System.IO.FileNotFoundException. Since then I have been trying to uninstall and delete files and remove registry entries and renaming the project files. By this time I think I have completely hosed the configurations and everything related to this solution. Is there any way to remove it all from my installation history and pull this thorn out of my system? I'm on the verge of a melt-down. But I would like the information on how to hunt down all the hooks that have been sunk into my machine. Where can I find this kind of info? Any keywords I should look for? Tag: Resize according to screen resolution ? Tag: 72731
- Next
  - 1
    - Drag & drop remote file on Windows Explorer Hi NG, I would like to drag items from my own ListView-Control to the Windows Explorer. Those items are remote files which are *not* locally present. I know drag&drop to the Explorer works fine if the files are locally present and the data part of the DoDragDrop operation contains an array of all files to be copied: data.SetData(DataFormats.FileDrop, new string[] {@"C:\test01.txt"}); To prevent my application as well as the Explorer from being blocked, while x MB are being downloaded, I guess there must be some other way to deliver files to the Explorer (e.g. via named pipes or directly via IO-Stream). Does anyone has any ideas? Thx in advance! Michael _________________________________________________ Technology Consulting Software and Web Development Client/Server Technologies http://www.ConsultingServiceSolutions.com Tag: Resize according to screen resolution ? Tag: 72730
  - 2
    - line draw and control avoidance Does anyone have example code that draws a line from point A to point B, but bends the line at right angles to avoid drawiing over (or under) other controls that exist between point A and point B? (C# preferred, but VB is OK). Tag: Resize according to screen resolution ? Tag: 72729
  - 3
    - Preventing a list view from having no selected items Is there a simple way of tweaking a list view so that the list view must always have at least one item selected? I realize I can do some fiddling with SelectedIndexChanged, keeping track of what items have been selected and restoring that selection if the the selected item count drops to zero, but if there's an easier solution, why go through all that trouble? Tag: Resize according to screen resolution ? Tag: 72726
  - 4
    - WebBrowser I have a form with a WebBrowser, how can i put a progress bar at the bottom of the webbrowser to show the progress of the load web-page event??? Thanks!!! Tag: Resize according to screen resolution ? Tag: 72724
  - 5
    - Detecting Screen resolution Is there a way to read what the screen resolution is set to on the system running your application? Any help is greatly appreciated. Tag: Resize according to screen resolution ? Tag: 72715
  - 6
    - Form Textbox Problem I have an inherited form which has some textboxes on it. After I load my data into the textboxes I try to click in the textboxes to edit the data. When I click the data I am only able to put the cursor at the beginning of the text box regardless of where I click. I am also unable to select text with the mouse. if I put the focus on another form and return to the form the textboxes work as they should. Has anybody had this problem and if so have they found a solution? thanks, Bruin Tag: Resize according to screen resolution ? Tag: 72714
  - 7
    - Datagrid Bug - Known Workaround? Hi All, I'm getting the following error which I can't fix by the workarounds I've seen suggested: "Error when committing the row to the original datastore. Index was outside the bounds of the Array" This occurs under the following circumstances: I have a dataset which gets returned from a WebService I create a dataview based on a table in this dataset which is used as the datasource for a datagrid in a Windows Forms Application The datagrid is set to readonly - I want to be in control of all updates and deletions. I delete a record which was displayed in the datagrid, and get a new dataset from the database and rebind the view to the datagrid. I then click on any row in the datagrid and get the above error. How can I tell the datagrid to forget the original data? Discard it? That I don't want it to commit anything to a datastore? I'm finished with it. Let's move on, I have fresh data? Any help appreciated. Ken Tag: Resize according to screen resolution ? Tag: 72712
  - 8
    - Toolbar icon images disappear when docked vertically - Bug? I have a simple C# Windows Forms application with two toolbars, using the standard .NET toolbar and imagelist classes. I want to dock one toolbar at the top and the other at the left edge of the form. In the designer they look fine but when I run the app the vertically-docked bar loses all its icon images. I've tried various settings like flat vs. normal, and I tried adding Application.EnableVisualStyles() and Application.DoEvents() before Application.Run(), but no difference. Is this just a bug (hard to believe one simply can't have vertical toolbars in .NET) or is there some setting or method I've overlooked? Thanks, Michael Kairys SL Corporation Tag: Resize according to screen resolution ? Tag: 72708
  - 9
    - Grabbing property value out of form that is no longer visible??? I am having trouble grabbing a form (that is still in existance) but that is not visible so that I can retrieve the appropriate property value out of it in another form. How can I do this? What is the best way to go about it to put it into a collection? Tag: Resize according to screen resolution ? Tag: 72701
  - 10
    - About Hosting Windows Form control in VB 6 or old ActiveX container I know that .NET does not support exporting controls as ActiveX controls http://support.microsoft.com/default.aspx?scid=kb;EN-US;311334 http://msdn.microsoft.com/msdnmag/issues/03/03/WindowsForms/ The supported containers are "MFC 7.x" and "Internet Explorer" Here is my question 1.) I make a usercontrol with .NET windows form 2.) I put this control on an ActiveX make with MFC 7.X and on an HTML page 3.) I put the ActiveX control on a VB form and I call the HTML page on a "WebBrowser Activex control" who is on the VB Form. This work correctly But does Microsoft Support this? Tag: Resize according to screen resolution ? Tag: 72698
  - 11
    - Font information Is there a managed method for retrieving font information? In particular, I need the ascent and descent of the font. All that the font object offers is Height which doesn't do me any good without knowing the descent since I need to find the base line. Thanks. Pete Tag: Resize according to screen resolution ? Tag: 72696
  - 12
    - NullReferenceException in UnsafeNativeMethods.PeekMessage and multithreading concepts in general I'm developing a simple applications that extracts data from files, that can eventually become large. I have logic that scans a particular folder, and for each file in the folder instanciates a parser class and processes the specified file. I want to start a background thread with the main logic to not freeze the UI. I am new to windows forms, so i had to try some scenarios and I am wonder what is the best approach. Also, when i manipulate the UI controls on the form from the worker thread it sometimes yields an error, the cause of which i can't exactly understand. More detailed explanation follows. I do the following: On the click event of a specific button I start the worker thread with: ThreadPool.QueueUserWorkItem( new WaitCallback(ReadTree), this ); ReadTree is a static method that scans the directory and parses the files found. While doing this, i want be showing percentage and a progress bar. It used to work with no problem - the background thread accesses and manipulates the controls of the form, that is passed as a paremeter. The problem is not caused by the pool, because i tried to start the thread also as follows: Thread t = new Thread( new ThreadStart( ReadTree ) ); t.Start(); Then, I did some change in the logic and the UI and i found that the application crashes, yielding a NullReferenceException in the following code, that updates the percentage label and the progress bar and adds a new record for the parsed file in a dataset, that is bound to a grid in the main form: ((frmMain)state).progressBar.Increment( (Int32)fileSize ); if ( parsedBytes < ((frmMain)state).totalBytes ) parsedBytes += fileSize; ((frmMain)state).lblPercentage.Text = Math.Round( ( (double)parsedBytes/(double)((frmMain)state).totalBytes ) * 100 ).ToString() + "%"; newRow = ((frmMain)state).dsFiles.Tables["Files"].NewRow(); newRow[0] = fileName; ((frmMain)state).dsFiles.Tables["Files"].Rows.Add( newRow ); However, if i simply run the method in the same thread there is no problem. The error does not fire every time when i change properties of form controls - it just happens on a particular file. No division by zero or anything wrong with the numbers. And, as i see it, the error is not actually taking place in the above code, but just happens in the mean time, because if all this is in a try-catch block, the exception is not caught. Also try-catch wrapping the starting of the thread - also nothing. When I do the following: try { Application.Run(new frmMain()); } catch( Exception ex ) { String txt = ex.Message; } I manage to catch the exception. Here are the details: {"Object reference not set to an instance of an object." } System.NullReferenceException StackTrace " at System.Windows.Forms.UnsafeNativeMethods.PeekMessage(MSG& msg, HandleRef hwnd, Int32 msgMin, Int32 msgMax, Int32 remove) at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at CadParser.frmMain.Main() in e:\\projects\\mj\\immpilot\\parser\\cadparser\\main.cs:line 303" string But curiously, when i comment the above code, no exception is being thrown. Another issue, that I find curious is that when i QuickView the state object (that is, the main form) the viewer takes very long time to load. Then, some properties are displayed correctly, while others show "error: cannot obtain value", for example the Text property of the label that I try to access. I see that this is a problem caused by a background thread accessing the forms elements, which doesn't seem to be the best approach, but where can i read more about this problem, and what exactly happens behind the stage. And also, what is the best workaround concept for this. I intend to do create a new class, that manages the scanning of the directory and the calling of the parsing functions, which does not tuch any form members. It will expose an event, for which the form will subscribe, and will alter the UI appropriately, according to the EventArgs passed. Is this the best approach? Any ideas where can i read more about more complex situations concerning windows forms and multithreading. Thanks everybody. Tag: Resize according to screen resolution ? Tag: 72695
  - 13
    - System.NullReferenceException : System.Windows.Forms Hi, I've been trying to trace this exception but I can't seem to find the source of the problem: Message: "Object reference not set to an instance of an object." StackTrace: at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)\r\n at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMetho ds+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)\r\n at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)\r\n at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)\r\n at System.Windows.Forms.Application.Run(Form mainForm)\r\n Thanks, RF Tag: Resize according to screen resolution ? Tag: 72693
  - 14
    - Ensuring a Form Object is set to Nothing Say I create a form as a child in the following fashion dim Mainfrm as frmMachine ' Globa public sub CreateForm( Mainfrm = New frmMachin Mainfrm.MdiParent = M Mainfrm.Show( end su Now when I close the form (clicking the x), the form gets closed but Mainfrm is still referencing the form address How do I ensure that Mainfrm gets set to Null, so that I can test for the forms existence? Is Mainfrm a type of hanging pointer What happens when, after the form has been closed and CreateForm() is called again? Does the original object get freed or overwritten? Will I have a memory leak? Is the memory freed as I read that memory is only freed when no objects are referencing that memory Am I approaching this incorrectly thanks in advanc Dyla Tag: Resize according to screen resolution ? Tag: 72687
  - 15
    - Catching events in separate thread? Hi all, I have a windows form that uses an imported COM class to talk to a legacy system. The COM object works asynchronously - An even is fired when data has been returned. This works fine, except that Im getting too many events fired! Thus my windows form becomes pretty sluggish and unresponsive, and CPU utilistaion is pretty high. Is there any way I can set up another thread to recieve and handle these events instead? Do threads have event loops? If so, how do I "direct" events to them? Am I tackling this in the wrong way? Thanks! Spammy Tag: Resize according to screen resolution ? Tag: 72686
  - 16
    - axWebBrowser View Mode I was unable to get any information on this in microsoft.public.dotnet.framework.windowsforms.controls and I wonder if anybody in this group can give me any pointers? When using the axWebBrowser to look at a folder/directory is it possible to set the view to 'Details' programmatically rather than having to keep using the context menu? -- Jeff Gaines - Damerham Hampshire UK Tag: Resize according to screen resolution ? Tag: 72685
  - 17
    - Richtextbox clipregion I want to draw a rule on left hand side of a richtextbox, it would have line numbers and should scroll whenever richtextbox scrolls To do that; i've two options 1. Place ruler and richtextbox on an panel; but the problem is that how can i synronize sroll operation! 2. Extend richtextbox and draw a ruler; but how can i tell base class not to draw over my ruler! Does anyone have an idea either one of them! I would be great to see a c# code :) Tag: Resize according to screen resolution ? Tag: 72681
  - 18
    - ThreadPooling in Grid Control Dear All, We have a Grid Control that fires a WebService in a thread to make UI responsive while the Grid Control is fetching the data...we had used ThreadPool.QueueUserWorkItem for this...this works fine if there is a single Grid object in a Form...if there are more than 3 Grid objects in the same form then we start getting http 404 errors... I would like to execute the population of the Grid one after the other...I guess this is not possible using ThreadPool.QueueUserWorkItem... Is using ThreadPool.RegisterWaitForSingleObject and Mutex the right approach for this? Any ideas? Please help... TALIA Many Regards Jack Tag: Resize according to screen resolution ? Tag: 72678
  - 19
    - user control host form gets disabled My main form contains a panel which I use to host user controls After I have added and then removed all instances of my user controls from the panel, then move focus away from and back to my app, my main form appears disabled Is there something I need to be doing in my user control? If I use a standard control e.g. Button I don't get the problem A simplified version of my code is shown below using System using System.Windows.Forms namespace WindowsApplication public class MyControl: UserContro public MyControl( this.Controls.Add(new Button()) public class Form1 : For private Panel PanelMain private MyControl t1 public Form1( MenuItem menuAdd = new MenuItem("&Add",new System.EventHandler(this.Add_Click)) MenuItem menuRemove = new MenuItem("&Remove",new System.EventHandler(this.Remove_Click)) this.Menu = new MainMenu(new MenuItem[]{menuAdd,menuRemove}) PanelMain = new Panel() t1 = new MyControl() this.Controls.Add(PanelMain) [STAThread static void Main() Application.Run(new Form1()) private void Add_Click(object sender, System.EventArgs e this.PanelMain.Controls.Add(t1) t1.Focus() private void Remove_Click(object sender, System.EventArgs e this.PanelMain.Controls.Remove(t1); Tag: Resize according to screen resolution ? Tag: 72676
  - 20
    - Controlbox MDI form Hi, I'm french and I don't find the answer at my question. You are my last chance and sorry for my english... I'm in VB .NET 2002 I have a MDI form with the property ControlBox at FALSE. When the MDI Form appears, no problem, we have not ther controlbox. But when I maximize the MDI Form, the controlBox appears and I DON'T WANT THAT !!!!! How Can I do for that this controlbox don't appears in this MDI form Thanks Sylo Tag: Resize according to screen resolution ? Tag: 72675
  - 21
    - No Touch and single instance applications not compatible? H I would like to build a single instance application. This means tha if the app is launched a second time it will simply pass any comman line arguements to the instance that is already running and won' start another instance (se http://www.codeproject.com/vb/net/sing_inistan.asp) This all works fine locally but fails under "No Touch" deployment. Th error is "Cannot find the assembly SingleInstance Version=1.0.1615.28371, Culture=neutral, PublicKeyToken=null" If you have any suggestions please send them to mark.evans@DELETETHISstats.govt.n Cheer Mar Tag: Resize according to screen resolution ? Tag: 72669
  - 22
    - No Touch and single instance applications not compatible? Hi I would like to build a single instance application. This means that if the app is launched a second time it will simply pass any command line arguements to the instance that is already running and won't start another instance (see http://www.codeproject.com/vb/net/sing_inistan.asp). This all works fine locally but fails under "No Touch" deployment. The error is "Cannot find the assembly SingleInstance, Version=1.0.1615.28371, Culture=neutral, PublicKeyToken=null". Please email any advice to mark.evans@stats.govt.nz Cheers Mark Tag: Resize according to screen resolution ? Tag: 72667
  - 23
    - Checking for instantiated form How do I check to see if a form is already instantiated in an MDI app? Tag: Resize according to screen resolution ? Tag: 72666
  - 24
    - TreeView flashing when resizing a form I've seen several posts from people who have seen this flashing in TreeView's when resizing a form. I've noticed it in my app, but only in the child windows. For example, my main form has a splitter with a TreeView and I do not get the flickering with it. I created a new Form based Windows app. Added a TreeView (dock left), then a splitter and a property grid on the right (dock fill). For this test, I added a panel and button at the bottom so I could create the child form. I created a second form and created it the exact same way - TreeView on the left, splitter and a property grid on the right. In the click handler for the button on the first form, I create a new "Form2" and call "ShowDialog" passing "this" in as a parameter to make the main form the parent for the dialog. After adding some nodes to each of the tree views, fire up the app. If you resize the main form, you won't see flickering in the tree view. Click the button to show the parent form and resize it - you will see horrible flickering. Now, why is that? With the exception of the extra panel to hold the button on the main form, they are identical, yet the child displayed with ShowDialog shows terrible flickering. If I had to guess (which I guess I am guessing right now :-) I'd say Microsoft was expecting that forms shown with "ShowDialog" would not be made resizable so they left out paint optimizations when resizing. If that is the case, how do we get rid of the flickering when resizing a dialog? Thanks, Terry Tag: Resize according to screen resolution ? Tag: 72665
  - 25
    - ListView Control I am wondering if it is possible to easily duplicate the ListView control behavior in the Windows explorer when a new folder is defined. I am talking about the scenario where the user wants to create a new folder, the control displays a folder called New Folder which is highlighted inside a rectangle so that the user can easily change the name of New Folder. That is a really slick interface but I know that Microsoft is famous for having slick interfaces that are very difficult for most developers to implement. I am wondering if the rectangle is a special owner-drawn customized implementation. Please advise. Thanks for your help. Best Regards, Paul J. Lay Tag: Resize according to screen resolution ? Tag: 72658

Hi everyone,
I have a problem that I cannot resize the components in the form according
to screen resolution and my buttons textboxes etc. all showed mixed :(
Can anyone show me a way to solve this problem basicly ?
Also I have a problem that I use a mdi parent a lot of mdi children .Left
side there is a tree view in the parent and when user chooses a form it
displays.But when user changes from form to form the forms vibrates while
loading ?Why it happens ?Because of the contol box field of each mdi
children a the top or any other thing ?
Thanks for your help.

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Re: Resize according to screen resolution ? by hirf-spam-me-here

hirf-spam-me-here
Sat Jun 05 08:20:10 CDT 2004

* "BARIS GOKBUDAK" <b20021899@cs.hacettepe.edu.tr> scripsit:
> I have a problem that I cannot resize the components in the form according
> to screen resolution and my buttons textboxes etc. all showed mixed :(

Have a look at the form's 'Scale' method.

> Also I have a problem that I use a mdi parent a lot of mdi children .Left
> side there is a tree view in the parent and when user chooses a form it
> displays.But when user changes from form to form the forms vibrates while
> loading ?Why it happens ?Because of the contol box field of each mdi
> children a the top or any other thing ?

I don't really understand how to repro the problem, so I am not able to
give you an answer.

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

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