System.NullReferenceException: Object reference not set to an instance of an object.
   at CafeF.Redis.Page.IndustryChart.LoadImage(HttpContext context, Int32 catid, Int32 type) in C:\Users\admin\Desktop\APPnews\CafeF.Redis\CafeF.Redis.BL\CafeF.Redis.Page\IndustryChart.ashx.cs:line 47