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//第一個客戶端的代碼
 /// <summary> /// 發送消息 /// </summary> /// <param name="hWnd">發送窗口句柄</param> /// <param name="msg">發送的消息類型</param> /// <param name="wParam">附加消息,根據msg參數區分使用</param> /// <param name="lParam">發送數據</param> /// <returns></returns> [DllImport("User32.dll", EntryPoint = "SendMessage")] private static extern int SendMessage(int hWnd, int msg, int wParam, ref COPYDATASTRUCT lParam);
 /// <summary> /// 查找窗口句柄 /// </summary> /// <param name="lpClassName">類名</param> /// <param name="lpWindowName">窗口標題</param> /// <returns></returns> [DllImport("User32.dll", EntryPoint = "FindWindow")] private static extern int FindWindow(string lpClassName, string lpWindowName);
 //當一個應用程序傳遞數據給另一個應用程序時發送此消息 const int WM_COPYDATA = 0x004A;

 private void btnSend_Click(object sender, EventArgs e) {     //根據標題查找到句柄     int hWnd = FindWindow(null, "客戶端2");     //組織數據     COPYDATASTRUCT cds;     cds.dwData = 0;     cds.cbData = System.Text.Encoding.Default.GetBytes(txtMsg.Text).Length + 1;     cds.lpData = txtMsg.Text;     //發送     SendMessage(hWnd, WM_COPYDATA, 0, ref cds);
 } public struct COPYDATASTRUCT {     public int dwData;//若發送較小數據可用此字段傳輸     public int cbData;//發送數據的大小（以字節為單位）     [MarshalAs(UnmanagedType.LPStr)]     public string lpData;//發送數據 }

//第二個客戶端的代碼
const int WM_COPYDATA = 0x004A;  /// <summary>  /// 重新DefWndProc方法，處理接收到的windows消息  /// </summary>  /// <param name="m"></param>  protected override void DefWndProc(ref System.Windows.Forms.Message m)  {      switch (m.Msg)      {          case WM_COPYDATA:              COPYDATASTRUCT myStr = new COPYDATASTRUCT();              Type myType = myStr.GetType();              myStr = (COPYDATASTRUCT)m.GetLParam(myType);              txtMsg.Text = myStr.lpData;              break;          default:              base.DefWndProc(ref m);              break;      }  }
  public struct COPYDATASTRUCT  {      public int dwData;//若發送較小數據可用此字段傳輸      public int cbData;//發送數據的大小（以字節為單位）      [MarshalAs(UnmanagedType.LPStr)]      public string lpData;//發送數據  }