using System;
using System.Windows.Forms;

public class AutoClosingMessageBox
{
    private System.Threading.Timer _timeoutTimer;
    private string _caption;
    private const int WM_CLOSE = 16;
    private AutoClosingMessageBox(string text, string caption, int timeout)
    {
        this._caption = caption;
        this._timeoutTimer = new System.Threading.Timer(new System.Threading.TimerCallback(this.OnTimerElapsed), null, timeout, -1);
        MessageBox.Show(text, caption);
    }
    public static void Show(string text, string caption, int timeout)
    {
        new AutoClosingMessageBox(text, caption, timeout);
    }
    private void OnTimerElapsed(object state)
    {
        IntPtr intPtr = AutoClosingMessageBox.FindWindow(null, this._caption);
        if (intPtr != IntPtr.Zero)
        {
            AutoClosingMessageBox.SendMessage(intPtr, 16u, IntPtr.Zero, IntPtr.Zero);
        }
        this._timeoutTimer.Dispose();
    }
    [System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
    private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
    [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
    private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
}