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Sample Download : http://code.msdn.microsoft.com/VBASPNETAutoLogin-023c5ab4 

Today’s code sample illustrates how to programmatically log a user into an ASP.NET site using HttpWebRequest Class.

To achieve this, we request the ASP.NET login form by using the HttpWebRequest GET method and get the html code.  Next, we substring the login page html code to get the __VIEWSTATE, __EVENTVALIDATION parameters.  We concat the __VIEWSTATE,__EVENTVALIDATION,Username, password and
loginbutton to the whole string and convert it to byte array.  Last, we submit the request data and get the return data and display it.

 

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