C# prefixing parameter names with @ [duplicate]

Answer 1

Try and make a variable named class and see what happens -- You'll notice you get an error.

This lets you used reserved words as variable names.

Unrelated, you'll also notice strings prefixed with @ as well -- This isn't the same thing...

string says = @"He said ""This literal string lets me use \ normally 
    and even line breaks"".";

This allows you to use 'literal' value of the string, meaning you can have new lines or characters without escapes, etc...

Answer 2

The @ prefix allows you to use reserved words like class, interface, events, etc as variable names in C#. So you can do

int @int = 1

Answer 3

event is a C# keyword, the @ is an escape character that allows you to use a keyword as a variable name.