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Windows Forms with Rounded Corners

Have you ever found yourself developing a custom user interface and needed rounded corners which work on different Windows Operating Systems?

If you are using Windows Vista this is easily achieved by using a rounded PNG image with transparent corners and setting the transparency property. This however does not work on systems such as Windows XP.

The following C# code can be used to ensure you have rounded corners on a number of Windows Operating Systems.

[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
private static extern IntPtr CreateRoundRectRgn
    int nLeftRect,      // x-coordinate of upper-left corner
    int nTopRect,       // y-coordinate of upper-left corner
    int nRightRect,     // x-coordinate of lower-right corner
    int nBottomRect,    // y-coordinate of lower-right corner
    int nWidthEllipse,  // height of ellipse
    int nHeightEllipse  // width of ellipse
// Set your own values
Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(1, 1, 10, 10 16, 16));

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2 Responses to “Windows Forms with Rounded Corners”

  1. Sahand // March 12th, 2009 at 1:41 am

    I have problem to create Rounded Forms with special design which is designed in photoshop with files: dxf or jpg/bmp in .NET Compact Visual Studio 2005 C#.
    .NET Comapct is very limited version of .NET platform and there is no Image Property for Forms in .NET Compact version.
    How i can create exactly the Image forms in my development project in Windows CE (Windows Mobile 6).

    Thanks in Advance.

  2. Beno Gorancic // March 12th, 2009 at 9:17 pm

    Sorry but I haven’t played enough with .Net Compact Framework to be able to help you out.

    I think you need to take a different approach if you want rounded corners but my suggestion is that you don’t do that. I personally would work with the default themes.

    Sorry I couldn’t be of more help.

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