debug in codebehind

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   Hi, i have a code behind file im making and i get this error:

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: 

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario. 

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
   ASP.questionaire_aspx..ctor()

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeType.CreateInstanceImpl(Boolean publicOnly) +0
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +66
    System.Web.UI.TemplateControlParser.GetCompiledInstance(Stri ng virtualPath, String inputFile, HttpContext context) +164

[HttpException (0x80004005): Failed to create page of type 'ASP.questionaire_aspx'.]
    System.Web.UI.TemplateControlParser.GetCompiledInstance(Stri ng virtualPath, String inputFile, HttpContext context) +338
    System.Web.UI.PageParser.GetCompiledPageInstanceInternal(Str ing virtualPath, String inputFile, HttpContext context) +43
   System.Web.UI.PageHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String path) +44
   System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, String path, String pathTranslated, Boolean useAppConfig) +699
    System.Web.MapHandlerExecutionStep.System.Web.HttpApplicatio n+IExecutionStep.Execute() +95
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +173

Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573 
The page it is being called from has debug on how do you put debugging for codebehind files on?
Thanks, Mart.