private void TxtMasterSearch_TextChanged(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt = sdal.SearchStudentAttendanceAndDetails(TxtMasterSearch.Text.Trim());
usd.lblStudentID.Text = dt.Rows[0][0].ToString();
usd.lblCourse.Text = dt.Rows[0][18].ToString();
usd.lblMailID.Text = dt.Rows[0][3].ToString();
DataTable dt1 = new DataTable();
dt1 = sdal.SearchStudentAttendance(TxtMasterSearch.Text.Trim());
usd.dataGridView1.DataSource = dt1;
}