How can I make Desktop video and Audio recorder in .NET, using .NET libraries? [closed]

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I'm so sorry for just before question...

I need to make a project for my univercity. My project is desktop video and audio Recorder on C#... I know that, ı must using Some of Libs on .NET... But Which or How.?

it's like Camtasia..

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There's at least one article on http://www.codeproject.com that shows how to do this: Capturing the Screen Image in C#