protected void SendTovessel()
    {
        if (chkSendTovessel.Checked == true)
        {
            TechnicalBAL objpurch = new TechnicalBAL();

            objpurch.Insert_sendToVessel(Request.QueryString["document_code"].ToString(), Request.QueryString["REQUISITION_CODE"].ToString(), 1);
            btnSendToVessel.Enabled = false;
            chkSendTovessel.Enabled = false;

            int sts = objpurch.Get_SendToVessel(Request.QueryString["document_code"].ToString(), Request.QueryString["REQUISITION_CODE"].ToString());
            if (sts == 1 || !Request.QueryString["REQUISITION_CODE"].Contains("-O"))
            {
                chkSendTovessel.Enabled = false;
                btnSendToVessel.Enabled = false;
            }

            String msg = String.Format("alert('Requisition has been sent to vessel'); ");
            ScriptManager.RegisterStartupScript(Page, Page.GetType(), "msgsentreq", msg, true);
        }
    }