Q:

How to recognize this character "\" in C#

I just want to write in Console this "\".
Console.Write("\"); 

But it doesn't recognize it like a string or character ,but as a command.

A:

\ is used as an escape character inside strings. In order to output the \ itself you need to escape it by doubling it up, or use a string literal by prefixing your string with @. 
Either of these will work.
Console.WriteLine("\\");

Console.WriteLine(@"\");

