How do I send a ISO8583 prefixed message

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C#

.NET

sockets

Hello All,

I am writing a POS application on a pos terminal in C# where i need to send
ISO 8583 message packet to bank's host server running Postilion
Termapp. I was able to successfully packed the message using the APIs
and send to the server using the serversocket. But my challenge is that
the bank's spec says that a 2-byte header is to prefixed all messages
sent to/from Postilion. Please, how do i go about this?

What I have tried:

This is my Message:

ISO0160000500800822000000000000004000000000000000401093254325642001

but the bank require the message with this two byte header: "\0C"

\0CISO0160000500800822000000000000004000000000000000401093254325642001

obviously not always is the same I want to know how to calculate it.