The interop prototypes and structures.

    [DllImport("User32.dll")]

    protected static extern int ReleaseDC(IntPtr hWnd, IntPtr dc);

    [DllImport("User32.dll")]

    protected static extern IntPtr GetWindowDC(IntPtr hWnd);

    [DllImport("user32.dll")]

    protected static extern int GetWindowRect(IntPtr hWnd, ref RECT rect);

    //The Win32 RECT structure rebuilt for interop

    [StructLayout(LayoutKind.Sequential)]

      public struct RECT

    {

      public Int32 left;

      public Int32 top;

      public Int32 right;

      public Int32 bottom;

      public override string ToString()

      {

        return string.Format("({0},{1},{2},{3})  ",left,top,right,bottom);

      }

    }

    <DllImport("User32.dll")> _

    Protected Shared Function ReleaseDC(ByVal hWnd As IntPtr, ByVal dc As IntPtr) As Integer

    End Function

    <DllImport("User32.dll")> _

    Protected Shared Function GetWindowDC(ByVal hWnd As IntPtr) As IntPtr

    End Function

    <DllImport("user32.dll")> _

    Protected Shared Function GetWindowRect(ByVal hWnd As IntPtr, ByRef rect As RECT) As Integer

    End Function

    'The Win32 RECT structure rebuilt for interop

    <StructLayout(LayoutKind.Sequential)> _

    Public Structure RECT

      Public left As Int32

      Public top As Int32

      Public right As Int32

      Public bottom As Int32

      Public Overrides Function ToString() As String

        Return String.Format("({0},{1},{2},{3})  ", left, top, right, bottom)

      End Function 'ToString

    End Structure 'RECT