public void checkTeacher()
{
int tid = Convert.ToInt32(txtLibTeacherId.Text);
var teacher = lbManageEntity.tbl_TeacherLogin.Where(x => x.TeacherId == tid).FirstOrDefault();
if (teacher != null)
{
lbManageEntity.AddTotbl_TeacherLogin(teacherLib);
lbManageEntity.SaveChanges();
CleanAll();
}
else
{
lblMessafe.Text = "Incorrect Teacher ID Pleace cofirm your id";
}
}