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 135:        string query = "delete b from basket b INNER JOIN products p on p.id=b.pid where @id=b.guid and p.count<b.count";
Line 136:        SqlCommand scon = new SqlCommand(query, conn);
Line 137:        scon.Parameters.AddWithValue("@id", Request.Cookies["shoppingcart"].Value.ToString());
Line 138:        SqlDataReader dr = scon.ExecuteReader();
Line 139:        dr.Read();

Source File: c:\inetpub\vhosts\lotusjewellery.ir\httpdocs\cart.aspx.cs    Line: 137

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   cart.deletebasket() in c:\inetpub\vhosts\lotusjewellery.ir\httpdocs\cart.aspx.cs:137
   cart.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\lotusjewellery.ir\httpdocs\cart.aspx.cs:40
   System.Web.UI.Control.OnLoad(EventArgs e) +107
   System.Web.UI.Control.LoadRecursive() +89
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1532


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4494.0