public void lbDRegister_Click(object sender, EventArgs e)
{
foreach (GridViewRow row in gvCourse.Rows)
{
int cid = Convert.ToInt32(row.Cells[0].Text);
RegistrationDAL cdal = new RegistrationDAL();
cdal.DeRegisterCourse(cid);
Response.Redirect(Request.Url.AbsoluteUri);
}
}
