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 96:         string query = "select * from products where id=@a";
Line 97:         SqlCommand scon = new SqlCommand(query, conn);
Line 98:         scon.Parameters.AddWithValue("@a", Page.RouteData.Values["id"].ToString());
Line 99:         SqlDataReader dr_seo = scon.ExecuteReader();
Line 100:        dr_seo.Read();

Source File: c:\inetpub\vhosts\babest.ir\httpdocs\products.aspx.cs    Line: 98

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   products.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\babest.ir\httpdocs\products.aspx.cs:98
   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:4.8.4494.0