How do I write the escape char '\' to code
How to escape the character \ in C#?
You just need to escape it:
char c = '\\';
Or you could use the Unicode escape sequence:
char c = '\u005c';
See my article on strings for all the various escape sequences available in string/character literals.
You can escape a backslash using a backslash.
//String
string backslash = "\\";
//Character
char backslash = '\\';
or
You can use the string literal.
string backslash = @"\";
char backslash = @"\"[0];