protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string id = ((Label)GridView1.Rows[e.RowIndex].Cells[0].FindControl("LabelID")).Text.ToString();
string grade = ((TextBox)GridView1.Rows[e.RowIndex].Cells[3].FindControl("TextBox1")).Text.ToString();
bm.ChangeGrade(grade, id);
DataBindList(Request.QueryString["Time"].ToString(), Request.QueryString["Course"].ToString());
}
