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First create a ShowFrom form in which two buttons are placed to confirm and cancel, respectively.

Add the following events to the button

Private void btn_ok_Click (object sender, EventArgs e) {this.DialogResult = DialogResult.OK; this.Close ();} private void btn_cancle_Click (object sender, EventArgs e) {this.DialogResult = DialogResult.Cancel; this.Close ();}

You can call the pop-up window by establishing the following function in the main form

Public static bool MsgShow (string msg = "undefined action prompt", bool bcancel = false) {/ / device pauses, beep starts / / VAR.gsys_set.beep_en = true Task mtask = new Task (() = > {lock (WarnObj) {warning frWarning = new warning (); / / error form frWarning.TopMost = true; frWarning.BackColor = Color.Yellow FrWarning.lb_msg.Text = msg; if (bcancel) {frWarning.btn_cancle.Visible = true; frWarning.btn_cancle.Enabled = true } frWarning.ShowDialog (); VAR.msg.AddMsg (Msg.EM_MSGTYPE.SAVE_WAR, string.Format ("{0}", msg)) If (frWarning.DialogResult = = DialogResult.OK) {frWarning.Dispose (); return true;} else {frWarning.Dispose () Return false;}); mtask.Start (); mtask.Wait (); return mtask.Result } private void button1_Click_1 (object sender, EventArgs e) {var ret = actiom.MsgShow ("ceshi", true); if (ret) MessageBox.Show ("ok"); else MessageBox.Show ("err");}

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