I only want one instance of my C# Windows Forms app ever to run at the same time. I'm familiar with the Singleton pattern of course. What's the best way to achieve that pattern with a Windows Forms app? ...more >>

I have a field that contains a user logon. I want to populate a textbox on a form with the username portion of the logon value. I need to determine the length of the logon field in order to substring just the name portion of the logon. I realize you can not define a string as a fixed length...more >>

How can I obtain the binding object for a column of a datatable bound to a datagrid so I can set up format and parse event handlers? The bindings collection of the currency manager (where it seems the bindings should be) is empty as shown below. DataTable dtTest; // populated datatable ...more >>

Hello Everyone, I have a vb.net app with about 300 textboxes for data entry. My users are complaining because the blinking cursor is not big enough to give them visual notification of which textbox they are on. Is it possible to change the size of a textbox's blinking cursor to make it...more >>

Are there any sample code for sending email from a window form? Thanks....more >>

It is possible to execute the Form_ControlAdded event, or any other event in a separated thread? I want that while controls are added to a form it shows a progress bar....more >>

Hi all, I have two bitmaps that I want to merge. One is a background image and one is a transparent bitmap that has text drawn onto it. I have tried to take the Graphics object from the background image and call Graphics.DrawImage() and draw the text bitmap directly onto the background. Th...more >>

Hi, I populate a Datagrid (WinForms) from a DataSet. Colum sorting is enabled for the grid. When I sort the grid by column, the default view gets refreshed, but the row index does not get updated. This of course creates a problem when I select a datarow from the grid - I'm getting the dat...more >>

I've got several like-named controls that I want to affect as a group. For instance, a combobox name cboHEAT is related to chkHEATLock and chkHEATLockLoad. This same pattern is repeated for several sets of controls. What I want to do is affect the sets of controls without having to hard-cod...more >>

Hi All, I am developing a .Net plugin for MS Project 2002 & 2003 and have come across what i believe to be quite an odd bug: When I execute a Project dialog from within a modal .Net dialog, the .Net dialog becomes modeless. Both 2002 and 2003 behave this way. I suspect that this is more ...more >>

I'm new to windows forms, and I'm a bit puzzled how to add child windows to the main window and interact between them. In my case I just want to open up an Options window which, depending on what the user does in there, affects things on the main window. There's no ChildWindow control as fa...more >>

Environment : VC.net , VB.net Hi All, I have an XSD ( XML schema definition ) for an xml. Is it possible to create a default form for an XSD. My requirement from that form is that it should be able to generate an XML conforming to the XSD. It should do basic validations for missing mandat...more >>

Hi there, This may be a stupid/newbie question, usual apologies if so, but I'm writing in C#, and I've got an application with an MDI setup, and I want to add windows in as child windows to the MDI's child windows. For example, my documents contain many objects, and I want to add a dragabl...more >>

I am trying to write a custom component which requires a filename. How do I mark my FileName property to tell the Visual Designer that I want an elipses button for the property that pops up and uses the OpenFile Dialog? -------------------------------- From: Mona Everett ---------------------...more >>

Hi, Everybody. I'm working on an MDI application with some heavy childs forms, In order to free up some resources I would like to close them as soon as another child window is shown above them. Any Idea about how can I do that? Thanks in advance, Nando ...more >>

I have two projects in vb.net i want to access some forms of a project into other . I need help immediately . what are the concepts to be used to invoke a form of other project in present project ...more >>

I have a form with a protected MainMenu, with protected MenuItems (File, Options, Help). I have a derived form which I wish to put a View MenuItem on. I use the GUI editor to enter the menu item details, and then I drag the new View MenuItem between File and Options. All fine. I then buil...more >>

Hi All! Maybe answered a zillion times before, but how do you cancel the ugly beep when hitting enter in a textbox. : ) C#, framework 1.1... TIA Per Rollvang ...more >>

When the user click the combobox, a table with multiple fiedls will be dropped down. The behavior of the drop down table should be same to the normal combobox. Any suggestions (using C#)? Looking for a clean way to get this other than manually show/hide a panel/datagrid with events, or, thi...more >>

I have a TextBox with the TextAlign=Left and the Text property set to a string larger then the view area of the TextBox. Why does the end of the string display in the TextBox rather then the left portion? I would have thought TextAlign=Left would have forced the left portion to be displayed....more >>

hi,guys. I am a beginner for .net 2003. I want to create a application run on PocketPC 2003 platform. How to create PocketPC 2003 platform? and can connect real device by ActiveSync 3.7 thanks ...more >>

I created a new control that inherits the combobox where I added a button next to the combobox. My problem is that the button does not seems to be consider as part of the new control. When I select the control in design time on the combobox part of the control appears selected. What is even m...more >>

Hi, [Using C# in .Net 1.1] I've created a usercontrol ( from now on called boxUserControl ) that I am using in my app. Because I dynamically create these boxUserControl instances and attach them to my ContainerControl - I'm using my custom layoutmanager. Rather than make the code that ...more >>

Hi, I have a parent form class from which various child form classes are derived. Within the parent form class I have the method :- protected void SetEnabled (bool enabled) { if (enabled == false) { // Set the cursor to an hour glass. this.Cursor = Cursors.WaitCursor...more >>

HI, i wanna help in how to create a public variable which should be accessed from any any in a project for c# windows application thanx in advance jeebu ...more >>

Hi all, I have a situation where I need to know when a Form has become visible on the screen due to another window being minimized. Example. Window A is the window(.NET Form) I want to check for visibility on. Window B is another arbitrary window. Window A is open and visible. Window ...more >>

Hi, I have to load xml file in treeview control also after selecting any node xml data of that node display in RichtextBox. Can you please help me with this. Thanks, Shailesh...more >>

I've been trying to draw a custom button in the title bar. I've tried ControlPaint.DrawCaptionButton as well as other things, but havent found a good way to put a button on the title bar of a form and somehow handle its click events...more >>

We have built an application that sends keystrokes to a 3rd party application for automation purposes. What I need to do is in some way ensure that only keystrokes sent by my application are received by the 3rd party app. I would like to write an application that monitors keypress events and ...more >>

I added a shortcut to a menu using this code: this.mnu1.Shortcut = System.Windows.Forms.Shortcut.Ctrl1; My assumption is that the shortcut would be Ctrl+1, but when the app runs its Ctrl+D+1. where did the D come from? I just want Ctrl+1 ...more >>

Can anyone point me to an article that gives standard Windows UI layout guidelines? stuff like button height, tab height, standard hot keys. basic Windows look and feel that professional software should go by. Thanks...more >>

i know this might sound a bit simple but how do you add an empty row into a combo box after populating with a dataset? i was trying this but it keeps erroring cbo_Category.Items.Clear() cbo_Category.DataSource = dst_DataSet.Tables(0) ...more >>

Does anyone know how I could perform a column based selection from a multi-line text box or if there is another control that would allow me to do this? The behaviour that I am looking for is the same as holding the ALT key and making a selection in MS Word. cheers mf...more >>

I set the default locale as Japanese in my system through control panel-> Regional Settings -> Click Set Default -> Select Japaneselanguage from the drop down list. Then i have restarted my system. Now my default language setting is Japanese. But how can i identify this Japanese through C# cod...more >>

Hello, I use a simple function in a derived datagrid class, to delete selected rows from the datagrid. It works fine when I select the rows by dragging the mouse from the first row to the last row. However, selecting rows by dragging in the opposite way throws a System.NullReferenceException ...more >>

Hello there, We are developing a .net application using the c# programming language. Our clients run either WinXP or previous MS operating systems (Win98-2k-ME). The problem is that we need to provide a consistent user interface experience for all our customers. We believe(as many do) that th...more >>

Any way I can programatically test whether my (c#) code is running in Debug or Release mode ? I want to load a smaller dataset when running in debug, for testing purposes. ...more >>

Wonder if someone can help me out here as I'm not making any progress with this... I have an application which uses an MDI window. When it is running, the application creates an instance of a COM object, passes into it an instance of a local .NET class from my application, and then calls a ...more >>

I am using the PropertyGrid control to view/edit properties of some COM objects. The problem I am having is that a few of the COM objects have a property or two which return E_NOTIMPL raising a NotImplementedException in the managed world. When an object does this, the PropertyGrid doesn't ...more >>

I am developing a commercial software app in VB.Net for a client and I need to implement licensing for the software similar to the licensing in Microsoft Office (requires product key,etc.). Are there some classes in the .Net framework that provide licensing functionality and product key creati...more >>

How to position cursor to the first character in the Datagrid cell (left part of the cell rather than the right). default seems to be end of the value in cell(right of the cell) when we use "F2" for editing. Any suggestions are greatly appreciated. Thanks...more >>

I have two grids, two datatables, and a relation object set up in a VB.net windows form. It is in a master detail set up so that the first grid is mapped to the first table via the datasource property. The second grid is mapped to the first table also but the datamemeber is set to the relation o...more >>

I have 24 text boxes on a form called C1, C2, C3 ........ I want to do the following For J As Integer = 1 To 24 Me.Controls("C" + J.ToString).Text = J.ToString Next This code is wrong of course as Controls is expecting an integer to use as an index. How do I make it work? ...more >>

Hello, I am developing an application written in C# .NET. E.g., there is a button when which I click on, "visible" of a few labels, textboxes are set to false, and "visible" of a few others are set to true. During this short operation, I can see components which are dissapearing and appearin...more >>

Hi how can i have a copy of microsoft word on a vb.Net form. i have done it very simply in VB6 using OLE: microsoft word document. but in VB.Net i don't know the way. any helps are welcomed. ...more >>

Hi I just wanted to Know when i click the button i need to browse the directory and the selected file path should be reflected back in the text box may i please know :-( -- Thanks and Regards Madhavi ...more >>

Hi, I noticed a little problem with the Graphics.MeasureString-Function: I have a Textline, which contains Tabs. I use a StringFormat-Object, which represents the TabStops. The DrawString-Method calculates the Tabs in the text correctly. But MeasureString ignores them. I'm using the function...more >>

I have downloaded this superb HTML Edit Control based on MSHTML http://www.windowsforms.net/ControlGallery/ControlDetail.aspx?Control=290&tabindex=0 And it's also really big..... Anyway, I would like to extend it with a very simple feature: typing completion. I need to know when the user typ...more >>