Server Error in '/parts-onlinev2' 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 223:    protected void loadModel()
Line 224:    {
Line 225:        DataSet ds = dbu.executeQuery("select * from (select distinct convert(varchar,md.model_select) as variant,(select top 1 id from tb_75020_model_detail where cc=md.cc and variant=md.variant) as bike_name_id,convert(varchar,(select top 1 id from tb_75020_model_detail  where cc=md.cc and variant=md.variant))+'-'+convert(varchar,md.variant_id)as variant_id from tb_75019_model_assign ma join tb_75020_model_detail md on ma.model_id=md.variant_id join tb_75010_model_master mm on md.root_model_id=mm.model_id where md.visible=1 and md.id=" + Request.QueryString["variant_id"].ToString() + " and md.variant_id=" + Request.QueryString["modelid"].ToString() + ") model order by bike_name_id");
Line 226:        if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
Line 227:        {

Source File: d:\IIS\webrfldr\TVSIndonesia\www.tvsmotor.co.id\www\parts-onlinev2\parts-detail.aspx.cs    Line: 225

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   _Parts_detail.loadModel() in d:\IIS\webrfldr\TVSIndonesia\www.tvsmotor.co.id\www\parts-onlinev2\parts-detail.aspx.cs:225
   _Parts_detail.Page_Load(Object sender, EventArgs e) in d:\IIS\webrfldr\TVSIndonesia\www.tvsmotor.co.id\www\parts-onlinev2\parts-detail.aspx.cs:28
   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:4.7.4087.0