Help me convert this very useful project from Codeproject into VB version

I tried this one project on this link, to convert to VB

http://www.codeproject.com/KB/ajax/UChat.aspx
 
But it gives me error in Timercallback in ChatEngine.vb
Also how do i create that Global.asax.vb in App Code folder
 Please show me


Thanks and Regards

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