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 37:     {
Line 38:         cnn.Open();
Line 39:         name = cnn.ExecuteScalar("select MainCategoryName  from  M_CategoryMaster where MainCategoryid=" + Request.QueryString["MainCategoryid"] + "").ToString();
Line 40:         if (Request.QueryString["SubCategoryid"] != null)
Line 41:             subname = cnn.ExecuteScalar("select SubCategoryName from subcategory where id=" + Request.QueryString["SubCategoryid"] + "").ToString();

Source File: c:\HostingSpaces\artandcraftfurniture\artandcraftfurniture.com\wwwroot\Category.aspx.cs    Line: 39

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   Category.ads(String cond, String cond1) in c:\HostingSpaces\artandcraftfurniture\artandcraftfurniture.com\wwwroot\Category.aspx.cs:39
   Category.Page_Load(Object sender, EventArgs e) in c:\HostingSpaces\artandcraftfurniture\artandcraftfurniture.com\wwwroot\Category.aspx.cs:32
   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:4.7.3770.0