Checking File Extension

          

        string ext = System.IO.Path.GetExtension(FileUpload1.FileName);


        if (ext != ".jpg" && ext != ".jpeg")

        {

            Response.Write("accept only jpg file");

        }

      else  

      { 

            FileUpload1.SaveAs(Server.MapPath("~") + "//upload//" + FileUpload1.FileName);

            Image1.ImageUrl = "~/upload/" + FileUpload1.FileName;       

      }

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