I saw many memory leaks problems in this group. But It seems that it's the new one. When you add controls to the form, then delete them using this.Controls.Clear(), memory is not released. Simple example: private void button1_Click(object sender, EventArgs e) { for (int k = 0; k < 50...more >>

I am programming in c# and making a windows forms application. I don't want to make a windows service. How can I make sure that only once instance of the application runs ? If you try to run another instance , it should bring the running instance to the foreground and exit itself. The secon...more >>

Hello folks, The problem I have is this: I have a datagrid with custom column styles. I bind this grid to a DataSet then I use the CurrencyManager to handle the PositionChanged event. The problem is I get this error saying "No value for index 1" and the grid becomes a huge red X when I chan...more >>

If I add rows to a table like: _dtManualOrderItem.Rows.Add(mo) How does the DataGridView get notified of this event? I don't see a Bind or Rebind method. If I remove the binding and readd it: dgvOrderItems.DataSource = Nothing dgvOrderItems.DataSou...more >>

Is there a way to set the default printing and the orientation by Code using the webbrowser class? Thanks, Victor ...more >>

Until now I have worked on small teams (1-3 developers) and we've been able to stay out of each others way. Now I'm about to start work on a project that will have 5 developers. I would appreciate some guidance on how we can proceed to develop without having to worry about "who is working on w...more >>

How can I update a WinForm without stealing focus? I have a main form which has a Timer to perform updates (query data and display it on the form). (Yes, it uses Invoke.) I also have menu items that can display dialogs to set various things. The problem is that when I have a dialog open an...more >>

Hi all, I have made a derived Listview which can accept the controls as items in it. Controls that we are using are Buttons in each row and implemented Grouping with the help of controls(label on panel) . Coz Inbuilt listview Grouping not supported in OS like window 98. Although I had u...more >>

I want to create a client app, adding value to and building on my Web app. The user of this client app will be able to seamlessly access the public web site, but will also have additional functionality and content not available on the public site. The rational is to allow the user to work dis...more >>

After a form is closed, it is still there and crashes when you want to close it again...... Here you see the error report: Exception report - Tuesday, June 20, 2006 1:31:49 PM Object reference not set to an instance of an object. Source : HRAFrameApp StackTrace : at HRAccent.UI.List...more >>

I can't find the "disable" property of tabpage. How to do it ? Someone said that we can set the tabpage's text color to "grey", so I code as: this.tabpage1.forecolor = Color.Gray. but it can't work, why? ...more >>

I wanna draw any window surface without window-type limitation. So far, using PrintWindow API seems to be a good choice, but I never successfully invoke it. Always return false. I totally don't know why. Sigh... WM_PAINT? Some controls never response to her. :-( Bitblt? This most straightfo...more >>

Hello All I have .dll files of Swap machine which can both read/write in the card.Now i want to develope the .net program to read the card when some one swap the card on the machine. Does any one has any idea how to do this Thankx Prajesh ...more >>

Hi, my windows forms (.net 2.0) application is frozen after power mode changed back from standby or when resolution is changing. Any idea what could be the reason? Regards, Bernd ...more >>

Hi all, I have a Form (FormA) that contains a ListView. Recently, we've decided to add elements (ListViewItems) to this ListView that can be "activated" (probably a single or double click with the mouse) by the user. This "activation" will spawn a new Form (FormB)- in which the user selects so...more >>

Tricky question, is there a way that when you have a windows.form app using webbrowser class to view and run webapps on it when ever you open a new window browser the session will still be the same as the parent? Everytime I opened a new window to capture some data the new window browser ...more >>

I'm trying to set the desktop wallpaper to nothing and change the desktop background color. I can successfully remove the wallpaper but it doesn't refresh the desktop background color until I reboot. Does anyone know how to tell windows to refresh the desktop background color? thanks! h...more >>

Hello, There seem to be so many places out there to host asp.net Web Applications I figured I had better put an article on this forum to get some advice. Basically I have an asp.net Web Application that I'm interesting in Hosting on the Web. I'm planning to offer a training video subscripti...more >>

I have one MainFORM form (it hase dataGridView and button). one class called DoEverithing (works with data base) Form PleaseWait (with progress bar) Here is my problem: When I click button in Main form i want to populate datagridview with some data from database. here is a call: in MainFO...more >>

Hi all, I am using VS2005. I am using Datagrid view to edit some datas and update it. this is what I have bind to Datagridview SqlAdapter = New SqlDataAdapter() SqlAdapter.SelectCommand = SqlCmd Dim Cmd As New SqlCommand("Update Table_xxx Set Remarks=@q1 Where SiN...more >>

Dang, my status bar text doesn't update. It's got just one panel and it always shows the text I set at design time. ("Ready"). All I am doing is: Private Sub btnOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOK.Click 'Do stuff ...more >>

Hi all, I am facing a problem with the rendering of html into a windows application (C# .NET). I am trying with two possible approaches: 1. Use a control that directly renders the html into windows form, but it should not be dependent on IE or mshtml. I didn't get such kind of control so fa...more >>

Hi there! How can you get a KeyPress event for a form (with KeyPreview=true) that contains a DataGrid? Even DataGrid.KeyPress or KeyDown is never triggered! Any help greatly appreciated. Thx! /Pascalus...more >>

Hi all, ToolTip.AutoDelay vs. ToolTip.AutomaticDelay : When you set AutomaticDelay => AutoDelay is 5 x AutomaticDelay (as in http://msdn2.microsoft.com/en-us/ba01s7kc.aspx) or 10 x AutomaticDelay (as in http://msdn2.microsoft.com/en-us/system.windows.forms.tooltip.automaticdelay.aspx) ...more >>

Hi All, I use the AxWebBrowser control to display HTML pages in my application (.Net 1.1). Now the problem is, if my HTML page contains a web link and i click on that link, the corresponding webpage opens up in the same control. I require it to open a new instance of IE and open up there, l...more >>

Hi All, Can anybody plz explain me the difference between obj and bin folders and which one to use when ? Is referencing from one same as from other ? Thanks in advance. FUnky ...more >>

hi all the notion of smart clients seems a good one from a development perspective but there does not seem to be much literature around. not one current book. can anyone she light on the current state of play? is MS pushing this technology? or have we moved on? thanks Richard...more >>

Hello, I am trying to create a modeless form whose parent is another form. If the modeless form is toplevel it won't let me set the parent, if the modeless form is not toplevel it won't let me show. I 'solved' the problem by making the modeless form toplevel only after it is shown. This ...more >>

Hi, I have a splitter with two panels, on the right panel I want to display different user controls. How can I do ? private void treeView1_BeforeSelect(object sender, TreeViewCancelEventArgs e) { string strTag = e.Node.Tag.ToString(); if (strTag == "RemoteHelp") { ...more >>

How do I access the value of a checkbox in a DataGridView? It's an unbound column. Thanks....more >>

Hi, I am completely new to .NET and I have to developp a GUI application. My app needs to have a Form with a vertical splitter. On the left I have a treeview and on the right I display a different view in function of the selected node. How can I do that ? How can I know what node is sele...more >>

It has been suggested we use web services in our winform app. App is (insert,update,delete) data mgmt front end for an Oracle DB. Plan was to use C# to develop forms and PL/SQL for all data manipulation. How do web services improve this situation? 2.0 framework....10g r2 Oracle.... ...more >>

I have a listview, and currently there is the situation where a user can double click between two column headers, and the system will automatically resize the column header to the width of the longest text in that column. I want this calculation to take into account the width of the header as w...more >>

Using VS2003 C# I have a treeview control that navigates through a database in non heiarchal fashion. I start with the root node, which is just going to be the name of the database, so it will always just be that one root node. After that is expanded I will get a list of Computer Names from ...more >>

Drawing Solid and See Through Lines I want to create a custom form (all drawn in the pain event) that is part solid (i.e. non see through) and part see through (e.g. 50% opacity). I've tried setting the BackColor and TransparanceKey colors to the same value and drawing lines with different ...more >>

Sometimes I right click a node in a tree view and display a context menu. When the user chooses an option from the context menu, I want different things to happen depending on which node was selected. This seems pretty common and straightforward, the problem arises when I have node A selected,...more >>

I have an Visual Studio 2005 WinForms application in which I have a main form with a NavBar on the left, a menu and toolbar at the top, and a working area panel on the right. Depending on which link on the NavBar the user clicks on, I show the corresponding User Control in the working area panel...more >>

Hi there, Sorry, newbie, learning my way around ... I understand that ASP.Net is built on the assumption that the client does not run the .net framework, and that when you can assume that the client does run the framework, you should go the smart client way. I did a fast "is the buzzword ...more >>

This is a test post ! ...more >>

Hi, I encountered the following problem when trying to set control parent when the control reside in a different AppDomain. Here is the pseudo code descibing the problem: pay attention that both controls inherits from UserControl which inherites (indirectly)from MarshalByRefObject. c...more >>

Hi, I was wondering if there is a way to find out if a control exist on a form. I have the control name (btnApply) and I would like to do something like... form.controls("btnApply").exist as boolean. I know I could probably get there by looking in each control of the form control collection but ...more >>

I am having trouble getting Application.Restart to work. My somewhat lengthy startup code is shown below. Interestingly enough it will work, if I display a message box that displays Application.Application.Name. Just displaying the messagebox or just assigning Application.ApplicationName does...more >>

Using the HitTestInfo class in conjunction with HitTest I can get the row and column on a DataGrid. Now is what I would like is to translate that row and column to the row and column on the DataSource (in this case it is a DataTable). Any ideas? Kevin...more >>

I have a very simple CDialog-based application (VC++ 8.0/2005), where a DataGridView control is included through the usage of CWinFormsControl class. I experience the following problem with this application. If I switch to a different application (Alt+Tab, for example) while a grid cell is rem...more >>

Hello people, I am having problems getting my smart client app to run. First I got a problem about permissions... So I've searched newsgroups to find out a solution and I was pointed to a MS KB which help me get through it by strong naming my assemblies. Since I use Microsoft Application ...more >>

I’ve created a non rectangle form by setting the FormBorderStyle, BackColor and TransparanceKey properties and drawing on the form in the pain event or setting the BackgroundImage. What I would like to do is add a drop shadow to my non rectangle form. I did a search on the Internet for h...more >>

In Windows application,I have four buttons on Windows form. When I run, it doesn't show focus on first button....more >>

Hi, I have two forms A and B. Om form B i have a NEW button which should call form A and after a selection on form A it will call form B again. Hence a circular calling of forms. On both forms i created a event: Private Sub frmFormA_Deactivate(ByVal sender As Object, ByVal e As Syste...more >>

I searched all over the internet for this, I can't believe no one noticed that before. Here is the problem, if you have a ListView with lots of items (just enough get the vertical scroll bar on) and all the items belongs to one Group (it can be the default Group) you can't navigate to the last...more >>

Hi, I'm working on a piece of software that is now growing into a suite of software products. When I started the work, I wasn't fully up to speed with dotnet concepts (am I now either ;-), so the App is probably not built accoridng to best practices. Now I'm facing a situation, where I n...more >>

Hello, Can anyone tell me - is it possible to visualize html formatted string in Window.Forms.Label.Text? Thank You ...more >>

The form has many controls, so it take some time to show it out. But before the form finished showing, user can click the button on the form. Now, I want to prevent any user's event before the form showe method finished. How to do it? ...more >>

Hello, I have created a business class to separate the logic between the UI and code. I have loaded a dataset called dept. Dept has a few columns called dept, dept desc, family. I load only department in a drop down box. Later on the user get to choose the department and it load the data...more >>

Is it possible to open the run dialog box from code and execute a command? Thanks ...more >>

I need to write a non-mdi winforms application using c# and .net framework 2.0 that keeps track of open windows and binds to a control on the main application or shell. I can't use a MDI application becuase I need the application to support dual monitors where I can have multiple windows open...more >>

hi, i want to paint on a for wich opacity is 0 is it possible to paint e.g. an rectangel with an black border or is it impossible to paint on a Form with opacity = 0 and it's the total false approach? thanks Martin Maderza ...more >>

We have a C# Windows Forms application using the Decemeber 2005 CAB that I can't get to run on some of our Windows 2000 machines. The error is 'Exception has been thrown by the target of an invocation' falling over at the System.RutimeTypeHandle.CreateInstance method call. On the xp machines...more >>

Hi all, as you can see from the level of my question, i am pretty new to c# and programming in general. situation: i would like to update the UI of a form (main form of my application) from a second form (which was called from the first). Ideally when a button on the second form is pressed,...more >>

Hi, I am having a problem where the underscore for hotkey is not being painted on my MDI application. Only unuasual thing about my app would be that I have killed an internal border. Anyone else have this problem? ...more >>

Hi, I often try to search for code and get no results, because 1 of 70 codefiles i want is not open. How can I search codefile that is not open? Search hidden text is enabled. ...more >>