[RESOLVED] [2005] can't get handle with FindWindowEx

[vbdotnetboy]

*EDIT*

ok i figured out what was causing the problem but maybe someone could still explain to me why. i took out the Auto in the declaration then it works so why does that matter???
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i'm using the FindWindowEx as the following

Public Declare Auto Function FindWindowEx Lib "user32" Alias "FindWindowExA" _
        (ByVal hWnd1 As IntPtr, _
         ByVal hWnd2 As IntPtr, _
         ByVal lpsz1 As String, _
         ByVal lpsz2 As String) As IntPtr

I know the classname and the caption of the window i'm trying to get and i'm using the following code, but it's returning zero. accroding to what i saw on different site this should work for getting the window's handle. so my question is what am i doing wrong???

HSEstimateMainWinHWnd = WinAPI.FindWindowEx(IntPtr.Zero, IntPtr.Zero, "ThunderRT6MDIForm", _
            "Hendrick Manufacturing Order Estimating System")