protected void lnkbtn_B_Click(object sender, EventArgs e) { try { PatientClass pc = new PatientClass(); DataTable dt = pc.SelectForViewPatientRecords_SpecificLetter("B"); if (dt.Rows.Count > 0) { ltrMessage.Text = ""; GridView1.DataSource = dt; GridView1.DataBind(); } else { GridView1.DataSource = dt; GridView1.DataBind(); ltrMessage.Text = "No data found!"; } } catch (Exception ex) { ltrMessage.Text = ex.Message; } }