Main() and Command Line Arguments (C# Programming Guide) 

The Main method is the entry point of your program, where you create objects and invoke other methods. There can only be one entry point in a C# program.

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

Overview

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

• 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.

• Unlike C and C++, the name of the program is not treated as the first command line argument.

In This Section

• Command-Line Arguments (C# Programming Guide)

• How to: Display Command Line Arguments (C# Programming Guide)

• How to: Access Command-Line Arguments Using foreach (C# Programming Guide)

• Main() Return Values (C# Programming Guide)

C# Language Specification

For more information, see the following sections in the C# Language Specification:

• 1.1 Hello World

See Also

Reference

Inside a C# Program

Concepts

C# Programming Guide

Other Resources

Visual C# Samples