private void BtnDelClick(object sender, EventArgs e)
{
if (idtb.Text == string.Empty)
{
MessageBox.Show("请输入课程编号！");
return;
}
string cmd = $"delete from courses where cid='{idtb.Text}';";
DBO.Delete(cmd);
MessageBox.Show("删除成功！");
}
private void BtnDelClick(object sender, EventArgs e)
{
if (tbxs.Text == string.Empty)
{
MessageBox.Show("请输入学生学号！");
return;
}
if (tbxc.Text == string.Empty)
{
MessageBox.Show("请输入课程编号！");
return;
}
string cmd = $"delete from register where sid='{tbxs.Text}' and cid='{tbxc.Text}';";
DBO.Delete(cmd);
MessageBox.Show("删除成功");
}