protected void PopulateSearchColumnsDropdown()
 {
     try
     {
         DBOps   db = new DBOps();
         DataSet ds = db.GetInventoryColumns();
         ddlColumn.DataSource     = ds;
         ddlColumn.DataTextField  = "name";
         ddlColumn.DataValueField = "name";
         ddlColumn.DataBind();
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }