>>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.