public void fetch_mail_details() { toemail = ""; bus.role = Session["role"].ToString(); DataTable dtemail = bus.fetch_mail_details(); if (dtemail.Rows.Count > 0) { for (int i = 0; i < dtemail.Rows.Count; i++) { toemail = toemail + dtemail.Rows[i]["email"].ToString(); toemail += (i < dtemail.Rows.Count - 1) ? ";" : string.Empty; } } else { ScriptManager.RegisterStartupScript(this, GetType(), "displayalertmessage", "warning();", true); } }