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");
}
}