Linq Where value is in Array

Question

IEnumerable periods = new string[] {\"ABC\", \"JKD\", \"223A\"};

var someData = from p in returns  
               from d in p.ReturnDet  
                    


        

Answer 1

var someData = from p in returns  
      from d in p.ReturnDet  
                where p.Year > 2009 
                where periods.Contains(d.Period)

Answer 2

Use the Contains method.

var someData = from p in returns   
               from d in p.ReturnDet   
               where p.Year > 2009  
               where periods.Contains(d.Period);