ToArray

using System;
 
//добавить ссылку
using System.Linq;
 
class Program {
 public static int Main() {
 
  int[] ara1 = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
 
  var query =
  from val in ara1
  where val % 2 == 0
  select val;
 
  int[] ara2 = query.ToArray();
 
  foreach(var i in ara2) {
   Console.Write("{0} ",i);
  }
  Console.WriteLine();
 
  Console.ReadKey();
  return 0;
 }
}