'System.DateTime' does not contain a definition for 'HasValue '.

I develop a lightswitch application. But me make mistakes trying to build the application:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.LightSwitch;
namespace application
{

partial public class Section
{
       
SectionDisplay_Compute partial Sub (Ref DateTime result)
{

If ((this. Course! (= null) & (StartDate! = null) & (teacher! = null))
{

Assign the result to the value of the desired field

result = String.Format ("{0} ({1}) [{2} - {3}]", Course.CourseName, Teacher.UserName, StartDate.ToShortDateString (), ((StopDate.HasValue)? ") StopDate.Value.ToShortDateString (): "'));

}

}
}
}
This is the code. Get the following errors

Error 1 'System.DateTime' does not contain a definition for 'HasValue' and no extension method 'HasValue' accepting a first argument of type 'System.DateTime' could be found (missing are you a using directive or an assembly reference?)
Error 2 'System.DateTime' does not contain a definition of 'Value' and no extension method 'Value' accepting a first argument of type 'System.DateTime' could be found (missing are you a using directive or an assembly reference?)
anyone help me please in this ASAP?

Hello

What operating system is installed on the computer?

The question you posted would be better suited in the MSDN Forums. I would recommend posting your query in the MSDN Forums. You can follow the link to your question:

http://social.msdn.Microsoft.com/forums/en-us/categories/

Hope this information helps.

Tags: Windows

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