'Newline in constant'

Why am I getting this error because of this code:

Code:

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int intStart = str.LastIndexOf("\");

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str is a string

int intStart = str.LastIndexOf(@"\");

or

int intStart = str.LastIndexOf("\\");

the reason is because \ is a special character in c#
so either you use \\ to tell the compiler that ur looking for that character, or you use @ sign to make the text between quotation a string.

Thanks, a search on google turned up nothing but I did figure it out, lol. Guess I should have updated my post.