In a Verbatim string, backslashes are treated as standard characters, not escape characters. The only character that needs escaping is the quotation marks, which you can escape using the very same character:
string s2 = @"This is \t a ""verbatim"" string";
Of course you can never add special characters like \t (tab) using this method, so it is only useful for simple strings - I think I only ever use this when working with file paths.