private void LoadListByClass() { Fee d = new Fee(); int cid = Convert.ToInt32(cbxClass.SelectedValue); DataSet ds = d.LoadStudentFeeByClass(cid); if (ds.Tables[0].Rows.Count >= 1) { grdList.AutoGenerateColumns = false; grdList.DataSource = ds.Tables[0]; btnPayed.Enabled = true; btnNotPayed.Enabled = true; btnCancelSlp.Enabled = true; btnEdit.Enabled = true; } else { MessageBox.Show("No Fee Entry For Selected Class.", "Fee Status", MessageBoxButtons.OK, MessageBoxIcon.Information); grdList.DataSource = null; btnPayed.Enabled = false; btnNotPayed.Enabled = false; btnCancelSlp.Enabled = false; btnEdit.Enabled = false; } }