System.Diagnostics.Process with cmd.exe not working?

I'm trying to use xcopy with cmd.exe and for some reason it just isn't working. I can call cmd.exe and pass it the parms of "net send mypc hello" and it will work flawlessly but xcopy will not. I can do this in winforms but with webforms its a different story. I gave the aspnet user admin rights and full rights the the folder but still nothing. Does anyone have any ideas on why this is not working? I am trying to keep from having to use impersonation. thanks in advance, von

Dim startInfo As System.Diagnostics.ProcessStartInfo = New System.Diagnostics.ProcessStartInfo
        Dim p As System.Diagnostics.Process
        startInfo.FileName = "C:\\windows\\system32\\cmd.exe"
        startInfo.Arguments = "/c xcopy c:\test\test.txt c:\test\test.exe\"
        p = System.Diagnostics.Process.Start(startInfo)
        p.WaitForExit()