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Key Timer

/* Professional Windows GUI Programming Using C# by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury,     Zach Greenvoss, Shripad Kulkarni, Neil Whitlow Publisher: Peer Information ISBN: 1861007663 */ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Runtime.InteropServices; namespace Wrox.ProgrammingWindowsGUI.Chapter5 {     /// <summary>     /// Summary description for Form1.     /// </summary>     public class KeyTimer : System.Windows.Forms.Form     {         /// <summary>         /// Required designer variable.         /// </summary>         private System.ComponentModel.Container components = null;         private uint start = 0;         private uint stop = 0;         [DllImport("kernel32.dll")]         public static extern uint GetTickCount();         public KeyTimer()         {             //             // 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()         {             //              // Form1             //              this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);             this.ClientSize = new System.Drawing.Size(292, 142);             this.Name = "Form1";             this.Text = "Form1";         }         #endregion         /// <summary>         /// The main entry point for the application.         /// </summary>         [STAThread]         static void Main()          {             Application.Run(new KeyTimer());                      }         protected override void OnKeyDown(KeyEventArgs args)         {             start = GetTickCount();         }         protected override void OnKeyUp(KeyEventArgs args)         {             stop = GetTickCount();             uint elapsed = (stop - start);             MessageBox.Show(Convert.ToString(args.KeyData)+", time elapsed: "+Convert.ToString(elapsed)+" msecs");         }     } }