new BinaryWriter(stream) and Write method : Binary Read Write : File Stream C# Source Code

    
 

using System;
using System.IO;

class MainClass
{
    public static byte[] DecimalToByteArray (decimal src){
        using (MemoryStream stream = new MemoryStream()) {
           using (BinaryWriter writer = new BinaryWriter(stream)){
               writer.Write(src);
               return stream.ToArray();
           }
        }
    }
    public static decimal ByteArrayToDecimal (byte[] src){
        using (MemoryStream stream = new MemoryStream(src)){
           using (BinaryReader reader = new BinaryReader(stream)){
              return reader.ReadDecimal();
           }
        }
    }
    public static void Main()
    {
        byte[] b = null;

        b = BitConverter.GetBytes(true);
        Console.WriteLine(BitConverter.ToString(b));

        Console.WriteLine(BitConverter.ToBoolean(b, 0));

        b = BitConverter.GetBytes(3678);
        Console.WriteLine(BitConverter.ToString(b));

        Console.WriteLine(BitConverter.ToInt32(b, 0));

        b = DecimalToByteArray(12345678.123456m);
        Console.WriteLine(BitConverter.ToString(b));

        Console.WriteLine(ByteArrayToDecimal(b));
    }
}