C# Replace bytes in Byte[]

Question

What is the best way to replace some bytes in a byte array??

For instance i have bytesFromServer = listener.Receive(ref groupEP); and i can do Bit

Answer 1

Improving on rene's code, I created a while loop for it to replace all occurences:

public static byte[] ReplaceBytes(byte[] src, byte[] search, byte[] repl)
{
    byte[] dst = null;
    byte[] temp = null;
    int index = FindBytes(src, search);
    while (index >= 0)
    {
        if (temp == null)
            temp = src;
        else
            temp = dst;

        dst = new byte[temp.Length - search.Length + repl.Length];

        // before found array
        Buffer.BlockCopy(temp, 0, dst, 0, index);
        // repl copy
        Buffer.BlockCopy(repl, 0, dst, index, repl.Length);
        // rest of src array
        Buffer.BlockCopy(
            temp,
            index + search.Length,
            dst,
            index + repl.Length,
            temp.Length - (index + search.Length));


        index = FindBytes(dst, search);
    }
    return dst;
}

This method will work, but if the source bytes is too huge, I prefer to have a "windowing" function to process the bytes chunk by chunk. Else it will take a huge amount of memory.