C# Language "shortcuts", "BIT" variable defenition

Hi everyone!

My question may look to obvious to some of you and that is better for me ))))

At this page(this is the MSP430 LaunchPad Drive LED tutorial):http://processors.wiki.ti.com/index.php/MSP430_LaunchPad_Drive_LED

I found some things that were new to me (as a newbie in all this LaunchPad stuff), my question refers to this lines of code:

  [CODE]

#define LED_0 BIT0 
#define LED_1 BIT6

[/CODE]

 As I can understand from the above code,the "LED_0" is a name, and  BIT0 means 0x01 number, so wherever I'll use "LED_01" in my code the compiler will interpret this like "BIT0" which actually means 0x01. I'm little familiar with C# language, had some college courses, but in our labs we never used these shortcuts, only the direct input of Hex numbers (like 0x04 and etc)

 Now, back to "what I actually want from you":

My question is about these code "shortcuts", where can I get more info about it? Some User tutorials, where all this things combined and explained together? 

There is some Assembler User Guide that I found for LaunchPad but nothing for C# language.

Thanks in advance for your help.

Ivan