C# keywords as a variable

string @string = "";

Yes, prefix it with a @

String @goto = "";

Prefix your variable with the @ sign

string @class = "fred";

The @ sign can also be used to prefix a non-escaped string literal:

string a = "fred\"; \\ invalid
string b = @"fred\"; \\ valid. the backslash is part of the literal 'fred\'

I use the latter from time to time but think the using an @ sign to name variables is ugly.