//第一種
 //Winform關閉窗體時提示
            if (MessageBox.Show(Properties.Resources.String_Close, Properties.Resources.String_Prompt,
                MessageBoxButtons.YesNo, MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.No)
                e.Cancel = true;

//第二種 
DialogResult result = MessageBox.Show(Properties.Resources.String_ReturnListGrid,
                   Properties.Resources.String_Prompt,
                   MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk);
            if (result == DialogResult.OK)
            {
                this.Close();
            }