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 207:        //SqlCommand cmdser = new SqlCommand("select procat_id from productdetails where pro_id=@pro_id", cn);
Line 208:        cmdser.Parameters.Add("@pro_id", Request.QueryString["pro_id"].ToString());
Line 209:        string sid = cmdser.ExecuteScalar().ToString();
Line 210:
Line 211:        SqlCommand cmd4 = new SqlCommand("prodetails",cn);

Source File: d:\HostingSpaces\transtecoverseas.com\transtecoverseas.com\wwwroot\product-details.aspx.cs    Line: 209

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   product_details.getlist() in d:\HostingSpaces\transtecoverseas.com\transtecoverseas.com\wwwroot\product-details.aspx.cs:209
   product_details.Page_Load(Object sender, EventArgs e) in d:\HostingSpaces\transtecoverseas.com\transtecoverseas.com\wwwroot\product-details.aspx.cs:30
   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:4.7.4081.0