I have overriden the combobox class in my application. Is there a way I can write code that triggers when the Combobox.Items collection is changed (I.E. myCombo.Items.Add or myCombo.Items.Remove) ?? I have tried using breakpoints with AddItemsCore and AddItemCore override functions but could ...more >>

I have a MainForm with a Panel1. My project also has a UserControl1. When a nav button is clicked in the MainForm the Usercontrol1 is loaded into the MainForm.Panel1. All that is working beautifully. I went into the user controls and added a label1 and a button1. When the button1 is clicked th...more >>

Is there any way that I can feed the path of a zip file to a vb.net windows forms app and get at the files within it? I don't want to be reliant on having winzip loaded on the client machine and I know that I could just package a dos unzip utility in my app, but is there a better way of doing i...more >>

Hi there, The Main() of a Windows Forms application launches a dummy, invisible form: Sub Main() Dim f As FormFoo Try f = New FormFoo f.ShowDialog() ' '-- perform some post-processing ' Catch ex As Exception ... Finally If Not IsNothing(f) Then f.Dis...more >>

Hi newsgroup, how can I suppress the validating_event from a control received the focus in a modeless Form when pressing the cancel-Button or the ESC-Key? I already set the CausesValidation-Property of the cancel-Button to FALSE, without effect. If I set both properties to FALSE (cancel-Bu...more >>

I created a form that displays one record depending on the choice made via a combo box. In otherwords muliple records are Not filled into the form's dataset, only one. Hence there is no navigation. When I change a field on the form and press update, that routine first checks to see if the...more >>

BindingManager has two properties, PositionChanged and CurrentChanged What is the difference between them. I want to set flags on my form depending on the value of the current record displayed on the form. (update date & checkboxes). Which event would I put my code into? Thanks H...more >>

I am taking an ASP.NET application offline (into a windows forms app) and I was wondering if anyone can help me in two particular areas. 1 - On the web, Response.Redirect directs you to a different web form. However, in windows, all I can find is Form.Show, which opens a form in a new wind...more >>

Hi All Can we convert Windows Forms into Web Forms and/or vise versa? I have heard that this is possible through some third party tool, i m not sure. if yes then how much it will cost, i mean, what if my Windows Form contains few codes related to Threads then will it also be the...more >>

Hi, Is there a way to modify the keyboard output? For example, I would like change the "a" character to "b" when the user presses the key and my application is running. I'm using a keyboard hook class, it can be found at http://www.codeproject.com/csharp/globalhook.asp?msg=1033410. However...more >>

Hi there I have a module writen in VB.NET compiled using vbc as sync.exe. If I point IE to http://localhost/sync.exe the Windows Form loads perfectly. But I don't get the same if, from within ASP.NET code, I run the following ~ Dim ass As Assembly = Assembly.LoadFrom("C:\Inetpub\wwwroot\...more >>

I get an error "System.ArgumentException: '0' is not a valid value for 'value'" when trying to populate a DataGrid control while a Microsoft Windows Form is minimized. After some research, I found this ... http://support.microsoft.com/?kbid=838087 So I downloaded the latest .NET framewor...more >>

I have an application which will scan various folder for files. Each folder scan will be in it's own thread. The thread iterates the folder and creates a ListViewItem with various pieces of information about the files found. The file name and folder name are separated into two subitems and w...more >>

Hi All, When you close a form using myForm.Close(), does that actually destroy the form and make it available for garbage collection? I just want to make sure that I'm not supposed to do something to it after to make sure that the memory can be claimed back. I also have a timer object d...more >>

dear all, i found that the toolbox, properties column, help...etc are hide and slide out automatically and are neatly located as a tab-like at both left and right hand side of the VS IDE application. I am wondering how to make this controls? Also, the collapsible panel bars icons appeared i...more >>

I have a Class Library that contains a Form and several helper classes. A thread gets created that performs processing of data behind the scenes and the Form never gets displayed (it is for debug puposes only and is not normally visable to the user.) The Thread function is actually in the Form c...more >>

Hi. I need change the state (maximize/minimize/restore...) of an application acording to some events. How can make an application minimize or maximize itself. note: my app have a NotifyIcon with the ShowInTaskbar property in false, I want when I click on some menu item (in the NotifyI...more >>

I'm working on a sort of paint program that has the usual canvas pane in the middle of the main form. I'm working on that class and have a couple quick questions.. actually more like I'm looking for opinions. 1) I want a ruler running along from top left to top right and from top left to botto...more >>

Hi, Im wondering how a UserControl can be created using native win32 code. The reason for doing this is that i need to have access to the message pump and a way to render to it in the fastest possible way using managed DX. The "UserControl" will be hosted in a IE browser. Cheers, ...more >>

I am curious about ways to play a vido inside a vb.net application. Are there controls for this purpose or some classes in Net which allow this. I am not talking about creating a video, just something that can take the file and play it inside my application. Thanks, Fred Herring...more >>

I've created a Dialog box with textbox to display messages to the user of the program. Whenever I write text to the text box it always comes out highlighted. I can't seem to figure out how to de-highlight the text within the textbox. Anyone have any idea how to do this? Thanks M...more >>

I think I need a nested query but here's the problem. I promise i've exerted my meager brain power on this problem & ask this as a last resot! 3 Tables PatientTable PatActive, PatID ProfileTable PatID, CodeID, OtherInfo, MedicineID MedicineTable MedicineID MedicineInfo ...more >>

Hi all, When you click a control, OnClick is called which in turn calls the Click event. OnClick takes as an argument an object of type EventArgs which it then passes to Click. However, the default behavior is that the EventArgs that is sent is an empty one. I want to pass in some values...more >>

Is there a way to add a Windows MessageLoop to an existing thread? I have a ..NET application that is called from from a COBOL app using COM, and when I show a form, the System.Windows.Forms.Application.MessageLoop is set to false. Is there some way to ensure that the form displayed has a Me...more >>

I work on a data acquisition system. I need to display data as it comes. There are two different modes: 1. Display only current set of data each time it is ready. 2. Display the current data, but don't erase the previous one. I remember in MFC I was able to do this by changing one parameter ...more >>

Hello. It seems that in order to get the help (?) button to show in the top right of a form, the minimum and maximum properties need to set to false. I would like to have a help, minimise and exit button on my form. Is there any way to do this? Many thanks for your assistance. ...more >>

Hi, I'm using Visual Studio.Net 2002 and I can no longer open my windows forms in Design mode. In the Solution Explorer, I see the white "VB" icons instead of the grey "Form" icons. I already tried rebuilding the whole solution and made sure and all of the references are correct but it still...more >>

How to write windows application in VB.NET , which on getting the error should restart ...more >>

I haven't received an answer to my question of a few days ago regarding a flipped treeview control posted in the dotnet.framework.windowsforms.control newsgroup, so I thought I'd ask it again. Sorry about the cross-posting, but I'm getting desperate as the drop-dead date, the 25th of this mon...more >>

I have a WindowsForm application that I developed on my XP workstation. It is a nulti-threaded socket application that sends and receives messages. On my workstation I can close and restart the application normally with no ill effects. Now when I put the application on a Windows 2000 Server it...more >>

Three quick (I hope) questions regarding async programming in a windows form: 1) When I perform a BeginInvoke on a delegate in my own thread (actually the main GUI thread) in the midst of a message event handler (say OnMouseUp), does the implementation basically work the same as the BeginIn...more >>

Hi, I am populating a records fetched from a select query in OleDbDataReader. The datbase is MS Access, The datatype of the select query column is Text. I want to read the data as Byte array instead of string as Reading it into a string causes it to be converted to Unicode which is do not wan...more >>

Hi, I have a sitiuation in which I need to initiate a drag operation on a grid based on a menu click or button click. For example, the user right clicks on the grid and a context menu is shown. One of the menu's is called "Move". If the user clicks on the Move menu item, the grid should ...more >>

Hi folks Sorry if this is OT, but I got no joy in microsoft.public.win32.programmer/gdi. (1) I'm encoding to standard (built-in) formats: JPEG, BMP, GIF etc. I currently have the encoder CLSIDs hardcoded. Is that safe, or should I iterate the encoders at runtime, looking for ones with the...more >>

Hi, We have find memory leaks when we tried to use timer to raise event at specified interval. The OS we use is: Windows XP Professional Version 2002, service Pack 2, IDE is: Visual Studio .NET2003. Microsoft .NET Framework 1.1, version 1.1.4322 SP1. To repeat this problem, 1. creat ...more >>

Hello, I have a main form (MainForm) which contains File->New menu item. On clicking File->New menu item, i am displaying a form (ChildForm) which contains a lot of controls and a lot of complex code. Everytime the File->New menu item is clicked, a new instance of ChildForm is created and sho...more >>

I have written a custom databound grid control that we've been using successfully for months, but one of our developers has just run into a problem that I can't figure out. The code for setting it up is as follows: DataSet dataSet = new DataSet( "TestSet" ); DataTable tableParent = dataSe...more >>

Is it possible to resize a form based on the size of its contents? In VB6- we had ScaleWidth & ScaleHeight properties, with which one could get/set the form size to fit exactly. Is there an analog in the .NET Framework? Thanks! -Evan...more >>

I have a treeview control on a form with Scrollable=True. If a user scrolls the list and then selects a node, the selected node returned by the AfterSelect event is always the topmost visible node in the list, not the node selected. This also happens for the click event, but double-click w...more >>

I have an application based on the Issuevision example at MSDN. The program falls over at this line: Application.run(New MainForm) Call Stack// 'DefaultDomain': Loaded 'c:\windows\microsoft.net\framework\v1.1.4322\mscorlib.dll', No symbols loaded. 'RevMed': Loaded 'C:\Sandbox\MedOOP2\...more >>

Hi, I have a windows form, in C#. It has a ListView on it. For a couple of reasons I now need to be have multiple sets of Data that can be dynamically Copied into and out of the ListView. But I'm having realy trouble with it....and feeling pretty frustrated. I firstly tried copying ov...more >>

I have come across a strange BUG in VS 2003 that drives me nuts and makes working in the Windows Form designer sometime impossible. This usually happens when I have made a lot of changes to a form by deleting then re-adding a bunch of controls. The problem happens when I try to re-add cont...more >>

I have bound datagrid to a dataset with a datarelation defined between work orders and line items of those work orders. The default navigation style is to present the [+] at each work order. You expand, and it shows the name of the datarelation in a new line, that is shown as a hyperlink. Y...more >>

hi, Looking for a reliable-easy to use Chart control. never used one before, so any advice / experience is greatly appreciated. ...more >>

Is it possible to track a general "MouseMove" event that monitors mouse movement anywhere within the screen, not just within a the scope of a Control? I'm writing logic that resizes a form on mouse move, but I'm finding that when the mouse falls out of the size of the control/form I lose th...more >>

I have some controls on my form which are bound to a dataset and some which are not bound. But whatever record is displayed on the form, I want to populate those control (datetime, combo, etc.) with the data in the current record. What event can I do this in ? PositionChanged of binding...more >>

How can I launch a webbrowser from my windows forms applications? The reason I need that is because I have a DataGridView with links in one of the columns. When clicking on it I process the click and then want to start a webbrowser loading the site that the link was pointing to. Thanks, Rob ...more >>

Hi there Every time I create a new Form in the VS 2003 IDE i see the following entry private System.ComponentModel.Container components = null; which constantly remains null, when I add controls (say a Button) or components (say Timer) on the Form. The protected Dispose() checks if...more >>

Hi, I am using ShellExecute() to print HTML files through Internet Explorer (to defalut printer). But I don't know how to bypass the Print Dialog. Any help/advise will be appreciated. Thanks in advance! DGU *** Sent via Developersdex http://www.developersdex.com *** Don't j...more >>

have an app that does batch printing. The Dialog telling me which page is being printed keeps poping up. It's very annoying!! Any way to disable it?? Thanks in advance. ...more >>

I am sure this is a dumb/simple question, but I am new to this stuff, so request for patience with me... I have OUTSIDE knowledge that there is activity regarding some records in a parent / child set of tables I am showing in what I want to be a read-only view in a grid. I have primary key ...more >>

Hi, I want to draw combobox to bottom of form. I have following code : ComboBox C = new ComboBox(); C.Font=FontNormal; Size CSize=C.Size; C.Location = new Point(0,this.Height - CSize.Height); // this.Height is Height of parent control this.Controls.Add(C); By me it is correct but down...more >>

I have a form with a listview to allow users to select an item. When they select one I fill in controls below it for them to modify the values. They can also just enter new values in the controls without selecting a listview item in order to insert new records. After entering new data if th...more >>

I have a windows forms that shows only one record at a time. The user selects the record he want via a combo box. Everything works fine for the first selection, however the textboxes do not automatically update their values when the combo box changes values. The textboxes are bound to a d...more >>

Hi, How I can get size of Graphics.DrawString in pixel ? Becuase after I draw string I need place after its combobox ... Thank you....more >>

Hello NG, in my MDI-App, I'd like to checkfor how long the User hasn't done anything (moved the mouse, pressed a key) so that I can do some stuff after a given amount of idle time. My first idea was to save the current time in a variable every time the user moves the mouse or presses a key so ...more >>

Hi I am writing my first .DotNet application out of the Wrox Professional 2003 Book. I would like to ascertain the screen size in use and size my forms accordingly but that topic does not come up in the relevant chapter on forms How do I get at the relevant computer environment information to...more >>

Hi there. I've for the past few days been experimenting with the use of non system fonts via the PrivateFontCollection.AddFontFile() method. If i do something like this: private void button1_Click(object sender, System.EventArgs e) { System.Drawing.Text.PrivateFontColl...more >>

hi i am working on a gui for a bigger project using managed c++ and wanted to put it in the namespace hierachy under cubes::gui so i did this in my form.h namespace cubes{ namespace gui{ public class [...] }} but now the design view does not work... it only does with ony one given nam...more >>

I have one project that must be rebuilt instead of just built in order for changes to be seen. This is the startup project. I am running in debug mode, and the project is checked to build in this configuration thru config mgr. what am i missing? ...more >>

I have a datagrid with a checkbox column. How can I make a messagebox appear if a cell with the checkbox gets checked or unchecked? thank you in advance. ...more >>

Hi all. I have an application to draw and design different documents, that supports linking and embedding of other documents (like, for instance, Corel Draw or Word). Then, the user can print their designs "WYSIWYG", so I load the external document inside an OLE document container control (VB6),...more >>

I implemented a double buffered listview to eliminate flicker. I set the following styles, then overrode OnPaint and did the drawing. Everything looks great! However, if I change the font from default, the column headers are not drawn with the new font and worse yet the scrollbar doesn't know...more >>

What I am trying to do is to change the round button background to grey and still keep the text label black, by overriding the "Enabled" property. The purpose is to keep the radio button reader-friendly while keep it non-editible. Somemhow I didn't find any property exposed to change the b...more >>

since you can't change items in a listbox that is databound, i have to add & remove items using its items collection. The thing about this is that with databinding, each item in the list can hold all the info for a particular datarowview and can be accessed by converting the list item back to thi...more >>

Hi, Is there a way to have a form as a control? Here's what I want to do: I have a datagrid which displays various information. However, I want to use it in multiple locations within the same application. Instead of creating an instance of the grid and linking up the same data on each for...more >>

I have an application that when launched under Windows XP, from an IIS web server, will not read values from the app.config file. I have looked at the IL code and attempted to reconstruct what AppSettings["key"] does. I can create a webclient and download the app.config file and can even ...more >>

Hi, Hi testing the Visual Studio 2005 Beta 2, i'm developed one application and save this project, when close the visual studio and reopen in another time with the application i produce this error OBJECT REFERENCE NOT SET TO AN INSTANCE OF AND OBJECT LINE 0 COLUMN 0 And not is possible ...more >>

I'm relatively new to programming in C#, so I'm probably missing something obivous. I've got several buttons on a form that I assign an image to when the user clicks each button. That works fine. If the user clicks the button again, I want to remove the image and just display the text in th...more >>

On Feb 12 I posted a request for some help with the subject "Changing the DataViewManager.RowFilter has no effect". I attached some sample code written against Northwind demonstrating the problem. I may not have been logged in with my MSDN Email account so I am reposting my request under t...more >>