Display the value with three elements in the GroupSize array in CSharp

using System;/* w ww  . ja v  a 2  s .  c om*/
using System.Globalization;
class SamplesNumberFormatInfo  {
   public static void Main()  {
      NumberFormatInfo myNfi = new NumberFormatInfo();
      Int64 myInt = 123456789012345;
      Console.WriteLine( "Default  :{0}", myInt.ToString( "N", myNfi ) );


      myNfi.NumberGroupSizes = new int[]  { 2, 3, 4 };
      Console.WriteLine( "Grouping ( {0} ):{1}",
         PrintArraySet( myNfi.NumberGroupSizes ), myInt.ToString( "N", myNfi ) );

   }

   public static string PrintArraySet( int[] myArr )  {
      string myStr = null;
      myStr = myArr[0].ToString();
      for ( int i = 1; i < myArr.Length; i++ )
         myStr += ", " + myArr[i].ToString();
      return( myStr );
   }
}