Record voice and video by using c# code

Thank You everybody.. Now I got
coding for capturing video and save in my local system. But when I came to implement that coding into my project, that showing errors like

Error 1 The type or namespace name 'DShowNET' could not be found (are you missing a using directive or an assembly reference?)

Error 2 The type or namespace name 'IBaseFilter' could not be found (are you missing a using directive or an assembly reference?)

Error 3 The type or namespace name 'IGraphBuilder' could not be found (are you missing a using directive or an assembly reference?)

Error 4 The type or namespace name 'ICaptureGraphBuilder2' could not be found (are you missing a using directive or an assembly reference?)

Error 5 The type or namespace name 'IVideoWindow' could not be found (are you missing a using directive or an assembly reference?)

Error 6 The type or namespace name 'IMediaControl' could not be found (are you missing a using directive or an assembly reference?)

Error 7 The type or namespace name 'IMediaEventEx' could not be found (are you missing a using directive or an assembly reference?)

I tried a lot to clear that errors and also searched for namespace and library. But still I couldnt clear that. Please anyone can tell me to clear that errors. Is there any namespace or library to add to clear that errors.

Thank you,
By Mary.