Model mapping?

When I run a page, I got object NULL value error. It seems like something may be wrong with the mapping to a field (statuscodes) in the edmx from the an entity as I passed a valid status for insert. I'm a newer. I need help on analysis and resolving.

Here's class definition -
public partial class cWorkflow
    {
        public cWorkflow()
        {
            this.Orders = new HashSet<Orders>();
            ... ...            
        }
    
        public byte flowId { get; set; }
        ...    
        ...
        public virtual StatusCodes StatusCodes { get; set; }
        public virtual ICollection<WorkfIS> WorkfIS { get; set; }
     }
}

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This is the function for inserting  -

 
public void InsertWFTable(..., Int32? StatusCodeId,...)
        {
            Workflow workflow = new cWorkflow();
            
            ...
            workflow.StatusCodeId = StatusCodeId;
             ...
            
            DataContext.Workflows.AddObject(workflow);

            DataContext.SaveChanges();
        }

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While debugging =>

 
public void InsertWFTable(..., Int32? StatusCodeId,...)
         {
            core_Workflow workflow = new cWorkflow();
            ... ...
            workflow.StatusCodes.statusId = StatusCodeId.HasValue ? StatusCodeId.Value : 0;
            ... ...
            DataContext.Workflows.Add(workflow);
            DataContext.SaveChanges();
        }

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At debugging at the line below, StatusCodeId has a valid value passed in, but StatusCodes is null. I need help to find where the problem might be and how to fix.

workflow.StatusCodes.statusId = StatusCodeId.HasValue ? StatusCodeId.Value : 0;

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I appreciate.
LVL 1
minglelinchAsked:
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Andrei FomitchevCommented:
StatusCodes _StatusCodes;
        public cWorkflow()
        {
            this.Orders = new HashSet<Orders>();
             _StatusCodes = new StatusCodes();
            ... ...            
        }
        public StatusCodes StatusCodes { get {return _StatusCodes;}; set{_StatusCodes = value;}; }
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minglelinchAuthor Commented:
Thanks a lot for the post.

In DB, table StatusCodes and table cWorkflow have 1 to many relation.  StatusCodes is on 1 side and cWorkflow is many side. The cWorkflow class definition does have code like yours but that's for opposite which means cWorkflow & otherProperty as 1 to many.

I appreciate further help.
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