private void Funcheckreferral() { if (txt_referralid.Text != "") { dt = objaccess.Getmemberbyid(txt_referralid.Text); if (dt.Rows.Count > 0) { hidden_referral.Value = dt.Rows[0]["memberid"].ToString(); string referal = hidden_referral.Value; } else { txt_referralid.Text = string.Empty; ScriptManager.RegisterStartupScript(this, this.GetType(), "keykey", "alert('Please Enter Valid Sponsor Id ');", true); } } }