private void ModifyTextBox2(String s)
 {
     if (textBox1.InvokeRequired)
     {
         ModifyTextBoxDelegate d = new ModifyTextBoxDelegate(ModifyTextBox2);
         this.Invoke(d, s);
     }
     else
     {
         textBox5.Text += "clien :" + s + "   connected" + "\r\n";
     }
 }
 private void ModifyTextBox(String s)
 {
     if (textBox1.InvokeRequired)
     {
         ModifyTextBoxDelegate d = new ModifyTextBoxDelegate(ModifyTextBox);
         this.Invoke(d, s);
     }
     else
     {
         textBox1.Text += s + "\r\n";
     }
 }