private void btnDelete_Click(object sender, EventArgs e) { if (tbCourseNo.Text == "") { return; } if (MessageBox.Show("确定要删除吗?", "", MessageBoxButtons.OKCancel) == DialogResult.OK) { int i = CourseManageAction.delCourse(tbCourseNo.Text.Trim()); MessageBox.Show(i + " row(s) affected"); } }