SingleOrDefault

using System;//  j  a  v  a 2 s. c  o m
using System.Linq;

public class MainClass{
   public static void Main(){
       int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};
       var query = numbers.SingleOrDefault(n => n > 9);
       Console.Write(query);
   }
}