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FlashWindow (user32)
 
.
Summary

C# Signature:

[DllImport("user32.dll")]
static extern bool FlashWindow(IntPtr hwnd, bool bInvert);

User-Defined Types:

None.

Notes:

Flashes the taskbar button of the window once to get the user's attention. This only happens if bInvert is true.

Tips & Tricks:

Please add some!

C# Sample Code

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.Runtime.InteropServices;

using System.Diagnostics;

namespace WindowsApplication1

{

    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        [DllImport("user32.dll")]
        public static extern int FlashWindow( IntPtr Hwnd , bool Revert );        
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.SuspendLayout();
            //
            // Form1
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(528, 266);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }
        #endregion

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {

            Application.Run(new Form1());
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            FlashWindow( this.Handle , false );
        }
    }

}

Sample Code:

    [DllImport("user32.dll")]
    private static extern bool FlashWindow(IntPtr hwnd, bool bInvert);

    public static void FlashWindow(System.Windows.Forms.Form window)
    {
        FlashWindow(window.Handle, false);
    }

Documentation
FlashWindow on MSDN

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