Main() method in C#

• The Main method is the entry point of your program, where the program control starts and ends.

class TestClass
{     static void Main(string[] args)
   {         // Display the number of command line arguments:
       System.Console.WriteLine(args.Length);   
    }
} 

• It is declared inside a class or struct. It must be static and it should not be public. (In the example above it receives the default access of private.)

• It can either have a void or int return type.

• The Main method can be declared with or without parameters.

• Parameters can be read as zero-indexed command line arguments.

Source:msdn