ASCII character 1 in C#

Question

Hello,

I need to communicate a delimiter to a customer, so that they know in a sentence : "Hey, here starts a new line"
We want to use a character which cannot be used by the users of the application.

I want to use the first ASCII character. How do I split up my large string with ascii character 1 in C#?

I think not char(1)  because char is unicode.

Thans in advance

Mark.