private void dataGridView1_CellMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
{
if (true)
{
string cid = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
CourseBLL bll = new CourseBLL();
bool b = bll.AddStuCourse(sid, cid);
if (b)
{
MessageBox.Show("选课成功");
LoadMyCourse();
}
else
{
MessageBox.Show("选课失败");
}
}
}