Question

I want to create a data packet and write it to socket.
This packet starts with ‘C0’ hex value.
In php I easily can create it with this code:

$a = "\xC0";  

now I want to create it in c#. How can do this?

Answer 1

In C#, strings are Unicode-encoded, so you shouldn’t use them for binary data. Instead use a byte array.

To create a byte array starting with C0, do something like this:

byte[] packet = new byte[] { 0xC0, /* Other values */ };

If you have an existing string that you want to send, you can use Encoding.ASCII to convert it to the bytes you need.