add a video file in winform application using system.Windows.Forms.WebBrowser control

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VB

WinForms

C#3.5

How to add a video file in winform application in using system.Windows.Forms.WebBrowser control?
I am using the below code to insert an image file but, I am got stuck while adding video.
can any one help me out.

Dim designDoc As mshtml.IHTMLDocument2

Browser_Design.DocumentText += ""
            designDoc = DirectCast(Browser_Design.Document.DomDocument, mshtml.IHTMLDocument2)
            designDoc.designMode = "On"

on buttonclick event:

designDoc.execCommand("InsertImage", True, Nothing)

Thanks,
neelam