private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == (char)Keys.Enter) { if (ClsBLL.CarBookRecord(textBox1.Text)) { frmBookLook fbn = new frmBookLook(textBox1.Text); fbn.Show(); } else { MessageBox.Show("没有车牌号为“" + textBox1.Text + "”预约信息!"); } } }