建一個確定窗體form2

背後程式碼

 if (textBox1.Text.Equals("123")) {                 this.DialogResult = DialogResult.OK;
            }

主窗體

在關閉事件當中寫程式碼

 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (MessageBox.Show("真的要關閉?", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
            {
                e.Cancel = true;
            }
            else
            {                 Form2 pw = new Form2();
                pw.ShowDialog();                 if (pw.DialogResult == DialogResult.OK)
                {
                    System.Environment.Exit(0);
                }
                else
                {
                    e.Cancel = true;
                }             }
        }