C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace multiplication
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] a = new int[2, 2] { { 1, 2 }, { 3, 4 } };
            int[,] b = new int[2, 2] { { 1, 2 }, { 3, 4 } };
            int[,] c = new int[2, 2];
            for (int i = 0; i <= a.Length; i++)
            {
                for (int j = 0; j <= b.Length; j++)
                {
                  c[i, j] = (a[i, j] * b[i, j])+(a[i,,j+1]*b[i+1,,j]);
                    Console.Write(c[i, j]+ " " );

                }
                Console.WriteLine();
            }
                Console.ReadLine();

        }
    }
}
erorr is like 
Index was outside the bounds of the array.

name=tony&image=....raw binary representation of an image.....

bool PostData(Stream stream)
{
  using (FileStream filetoUpload = new FileStream(filePath + "ImageFromBytes.jpg",  FileMode.Create))
  {
    byte[] byteArray = new byte[10000];
    int bytesRead = 0;
    bytesRead = stream.Read(byteArray, 0, byteArray.Length);

 //write image data, ignore the preceding string
 if (bytesRead > 0)
    filetoUpload.Write(byteArray, 16, bytesRead-16);
   ....
  }
}

name=randy&image=....raw binary representation of an image.....

filetoUpload.Write(byteArray, 17, bytesRead-17);