How to use multiple main in csharp

using System;

class ClassA
{
public static void Main()
{
Console.WriteLine("Class A");
}
}
class ClassB
{
public static void Main()
{
Console.WriteLine("Class B");
}
}



save this file as abc.cs
and compile with csc abc.cs/main:classA if you choose classA as entry point
and compile with csc abc.cs/main:classB if you choose classB as entry point