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 122:            string query = "delete b from shopbasket b INNER JOIN shopproducts p on p.id=b.pid where @id=b.guid and p.count<b.count";
Line 123:            SqlCommand scon = new SqlCommand(query, conn);
Line 124:            scon.Parameters.AddWithValue("@id", Request.Cookies["shoppingcart"].Value.ToString());
Line 125:            SqlDataReader dr = scon.ExecuteReader();
Line 126:            dr.Read();

Source File: d:\hostingspaces\daygym.ir\httpdocs\cart.aspx.cs    Line: 124

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   cart.deleteshopbasket() in d:\hostingspaces\daygym.ir\httpdocs\cart.aspx.cs:124
   cart.Page_Load(Object sender, EventArgs e) in d:\hostingspaces\daygym.ir\httpdocs\cart.aspx.cs:40
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0