How to make form rounded rectangle or round or triangle

I am developing an application in C# and there is a requirement of the form of the main window in rounded rectangle or some times triangle开发者_运维知识库 type or round shape. so, how can I achieve this kind of features in C# 2008

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I think this is what you're looking for:

http://www.codersource.net/csharp_custom_window_forms.aspx

Also you can google for it, there are plenty examples.

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Assuming this is on Windows Forms you can check these two articles on MSDN: http://msdn.microsoft.com/en-us/library/aa289517(VS.71).aspx
http://msdn.microsoft.com/en-us/library/aa984331(VS.71).aspx

You basically have to do the following:

• Remove the form border by setting its style to None
• Set a background image that defines the shape of your form
• Set the TransparencyKey of the form to the color that should be transparent

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Look at the Region property of your form. You can create a new Region, set its shape using it's various Add... methods and then assign the region to your form's region property.