Merge 2 sorted Array in C#

`using System;using System.Linq;namespace Merge2Array{    class Program    {        static void Main()        {            int[] A = { 0, 3, 5, 6, 9, 10, 13, 14 }; // already sorted            int[] B = { 1, 2, 4, 6, 7, 11, 12, 15, 16 }; // ditto            // create sufficiently large output array            int[] C = new int[A.Length + B.Length];            // create indices to keep track of positions in B and C            int indexB = 0, indexC = 0;            // iterate through A            for (int i = 0; i < A.Length; i++)            {                // iterate through B ignoring elements already added to C                for (int j = indexB; j < B.Length; j++)                {                    // if B contains elements which are smaller than the current element of A, add them to C                     if (B[j] < A[i])                    {                        C[indexC++] = B[j];                        indexB = j + 1; // value at which to start next iteration of B                                   }                    else                    {                        // stop iterating when there are no more elements of B smaller than current element of A                        break;                    }                }                // now add current element of A to C                C[indexC++] = A[i];                // if this is A's final element but there are still larger items of B, add them to C                 if (i == A.Length - 1 && indexB < B.Length)                {                    for (int k = indexB; k < B.Length; k++) C[indexC++] = B[k];                }            }            // check it worked                  for (int i = 0; i < C.Length; i++) Console.Write("{0} ", C[i]);            Console.WriteLine();            // Test do the same way by LINQ            int[] D = A.Concat(B).OrderBy(n => n).ToArray();            // check it worked again            for (int i = 0; i < D.Length; i++) Console.Write("{0} ", D[i]);            Console.WriteLine();            Console.ReadKey();        }    }}`