Doesn't the regular StartDate==null will give the same result ?
OTOH StartDate.Value is handier than having to case as in (DateTime)StartDate

>When using Nullable types, you have to use the .Value property.
>
>

>if (StartDate.HasValue())
>    StartDate.Value.Year ...etc.etc.
>

>
>~~Bonnie
>
>
>>>>Hi,
>>>>
>>>>I want to calculate the age in years so I have this code:
>>>>
>>>>

        public static int CalculateAge(DateTime? StartDate, DateTime CurrentDate)
>>>>        {
>>>>
>>>>            int YearsPassed = CurrentDate.Year - StartDate.Year;
>>>>            // Are we before the birth date this year? If so subtract one year from the mix
>>>>            if (CurrentDate.Month < StartDate.Month || (CurrentDate.Month == StartDate.Month && CurrentDate.Day < StartDate.Day))
>>>>            {
>>>>                YearsPassed--;
>>>>            }
>>>>            return YearsPassed;
>>>>        }

>>>>
>>>>I call this code like this:
>>>>
>>>>

int policyYear = CalculateAge(this.Entity.IssueDate, DateTime.Now);

>>>>
>>>>this.Entity.IssueDate could have a null value. Of course I get errors like this:
>>>>
>>>>

'System.Nullable<System.DateTime>' does not contain a definition for 'Year' and no extension method 'Year' accepting a first argument of type 'System.Nullable<System.DateTime>' could be found

>>>>
>>>>I've tried putting an if {this.Entity.IssueDate != null} around my call to the function and making th eparameter not nullable, but that hasn't worked. How do I adjust this code to work?
>>>
>>>That would depend on what you want to happen when Entity.IssueDate is null........
>>
>>If it's null, then I don't want the calculation to be done.