Webbrowser control File Download dailog Bypass

Question

Actually i want to download a file from website using Webbrowser Control, but because of File download Dialog box, i am not able to automate downloading process. For Bypass it i want to use webclient and need to transfer all session and cookies to webclient from WebBrowser Control or i need set all custom header from webbrowser control to WebClient.
 
Please Help me i am in very bad situation.
 
Thanks In Advance.....