Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 23:             }
Line 24:         DataRow dr = Cnn.FillRow("Select Active, Productname,SubCategoryId from Products where ProductId='" + Request.QueryString["ProductId"] + "'");
Line 25:         productname = Convert.ToString(dr["Productname"]);
Line 26:         Session["SubCategoryId"] = Convert.ToString(dr["SubCategoryId"]);
Line 27:         DataTable dt = Cnn.FillTable("select * from Products P join (select M.MainCategoryName,S.SubCategoryName,S.SubCategoryId from MainCategory M join SubCategory S on M.MainCategoryId=S.MainCategoryId)Sub on Sub.SubCategoryId=P.SubCategoryId and Active=1 where  P.ProductName='" + productname + "' and P.ProductId !='" + Request.QueryString["ProductId"] + "'", "Detail");

Source File: c:\HostingSpaces\websites\pdlhitkar.com\wwwroot\viewproduct.aspx.cs    Line: 25

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   viewproduct.Page_Load(Object sender, EventArgs e) in c:\HostingSpaces\websites\pdlhitkar.com\wwwroot\viewproduct.aspx.cs:25
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3770.0