using System;

public class Program

{

    public static void Main()

    {

        decimal testDec = 1211111.111111M;

        Console.WriteLine("Original value: " + testDec);

        Console.WriteLine("-----------------------------------------------------");

        var testBytes = Encode(testDec);

        Console.WriteLine("Encoded source bytes:" + ToString(testBytes));

        Console.WriteLine("-----------------------------------------------------");

        var result = Decode(testBytes);

        var resultBytes = Encode(result);

        Console.WriteLine("Encoded result bytes:" + ToString(resultBytes));

        Console.WriteLine("-----------------------------------------------------");

        Console.WriteLine("Decoded value: " + result);

    }

    public static decimal Decode(byte[] bytes)

    {

        int[] ints = new int[bytes.Length / 4];

        int index = 0;

        for (int i = 0; i < ints.Length; i += 4) /* Here is an issue - ints.Length should be bytes.Length */

        {

            ints[index] = BitConverter.ToInt32(bytes, i);

            index++;

        }

        decimal dec = new decimal(ints);

        return  dec;

    }

    public static byte[] Encode(decimal val)

    {

        int[] ints = decimal.GetBits(val);

        byte[] retVal = new byte[ints.Length * 4];

        int index = 0;

        for (int i = 0; i < ints.Length; i++)

        {

            byte[] bytes = BitConverter.GetBytes(ints[i]);

            bytes.CopyTo(retVal, index);

            index += 4;

        }

        return retVal;

    }

    public static string ToString(byte[] bytes){

        return String.Join(" ", bytes);

    }

    public static string ToString(int[] bytes){

        return String.Join(" ", bytes);

    }

}