using System.Runtime.InteropServices;  // for DllImport

public partial class Form1 : Form
{
    [DllImport("user32.dll")]
    extern static IntPtr FindWindow(string lpClassName, string lpWindowName);

    [DllImport("user32.dll")]
    extern static bool SetForegroundWindow(IntPtr hWnd);

    [DllImport("user32.dll")]
    private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int left;
        public int top;
        public int right;
        public int bottom;
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        IntPtr hWndTarget = FindWindow("WINDOW_CLASS", "WINDOW_TEXT");
        if (hWndTarget != IntPtr.Zero)
        {
			Rectangle rectTarget = new Rectangle();
			{
				RECT rect = new RECT();
				GetWindowRect(hWndTarget, out rect);
				rectTarget = new Rectangle( rect.left,
											rect.top, 
											rect.right - rect.left,
											rect.bottom - rect.top);
			}

			SetForegroundWindow(hWndTarget);	
		}
    }
}S