Serialize a class before sending with socket

[zvivered]

Hi,

I have the following class:

[Serializable()]
    class Class1
    {
        private int a;
        private int b;
        private int[] c;
        public int Init ()
        {
            a = 5;
            b = 6;
            c = new int[3];
            c[0] = 1;
            return 0;
        }
        public byte[] Serialize()  
        {  
             BinaryFormatter bin = new BinaryFormatter();  
             MemoryStream mem = new MemoryStream();  
             bin.Serialize(mem, this);  
             return mem.GetBuffer();  
         }  
    }

The following code calls the Serialize method:

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Class1 c= new Class1();
            c.Init ();
            byte[] buffer = c.Serialize();
         }
    }
}

But buffer does not contains only the data but also information for the deserialize process. I do not need it.

How can I write a "non default" Serialize that will do the work ?
Can I avoid unsafe code for this purpose ?
The exact size of data that must be sent is 2x4 + 3x4 = 20 bytes;

Thanks.