Hvordan finder jeg ud af om min form/window er forrest?

[DllImport("user32.dll")]
        static extern int GetForegroundWindow();
        [DllImport("user32.dll")]
        static extern int GetWindowText(int hWnd, StringBuilder text, int count);



const int nChars = 256;
            int handle = 0;
            StringBuilder WindowName = new StringBuilder(nChars);

            handle = GetForegroundWindow();

            if (GetWindowText(handle, WindowName, nChars) > 0)
            {
                if (WindowName.ToString() == this.Text)
                    CloseCounter = 0;
            }