private void ButtonClick(object sender, EventArgs e) { Button button = sender as Button; if (button != null) { if (button.Tag + "" == "close") { this.Hide(); form2.SetName(Global.GlobalVar, "close"); } else if (button.Tag + "" == "enter") { form2.SetName(Global.GlobalVar, "enter"); } else if (button.Tag + "" == "clear") { if (Global.GlobalVar.Length != 0) { Global.GlobalVar = Global.GlobalVar.Remove(Global.GlobalVar.Length - 1); form2.SetName(Global.GlobalVar, null); } } else { Global.GlobalVar += button.Tag + ""; form2.SetName(Global.GlobalVar, null); } } }