C#: Convert 1 Dimensional Array to Fixed Size 2 Dimensional Array

Code

using System;
using System.Collections.Generic;
using System.Linq;
namespace Utility
{
    public static class ArrayUtils
    {
        public static T[,] To2DimensionalArray(this T[] source, int block){
            var ret = new T[block, source.Length/block];
            for (int i = 0, offset = 0, len = ret.Length; offset < len; i++, offset = i * block)
            {
                for(int j = 0; j < block; j++){
                    ret[j, i] = source[offset + j];
                }
            }
            return ret;
        }
    }
}

Example Usage

int[] array1  = { 1, 2, 3, 4, 5, 6, 7, 8, 9};
int[,] array2 = array1.To2DimensionalArray(3);
/*
   array2 will be...
   {
     { 1, 2, 3 }, 
     { 4, 5, 6 }, 
     { 7, 8, 9 } 
   }
*/