>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........