protected void btnSubmit_Click(object sender, EventArgs e)
 {
     try
     {
         if (ddlCity.SelectedIndex != 0 && ddlAgency.SelectedIndex != 0)
         {
             objAdmin.CityId     = Convert.ToInt32(ddlCity.SelectedItem.Value);
             objAdmin.AgencyName = ddlAgency.SelectedItem.Text;
             DataSet ds = objAdmin.DispalyCylinderStatus();
             if (ds.Tables[0].Rows.Count > 0)
             {
                 gvCylinders.Visible    = true;
                 gvCylinders.DataSource = ds.Tables[0];
                 gvCylinders.DataBind();
             }
             else
             {
                 gvCylinders.Visible       = true;
                 gvCylinders.EmptyDataText = "No Data Available";
                 gvCylinders.DataBind();
             }
         }
     }
     catch (Exception ex)
     {
     }
 }