Why is "base" necessary?

You comment doesn't seem to be linked to any content, so I don't know precisely what context this is from. The class name is something you'd use in a static context. If you want to call a method on the parent, I think you can just call it. However, if there is a method with the same signature on the subclass, then you might need the base keyword. It's been a while since i did c#, but i tried to create a quick demo. (The following is the code and the output I generated in https://repl.it/languages/csharp )

class Super {
    public virtual void output()
    {
      System.Console.WriteLine("super");
    }
    public void otherout()
    {
      System.Console.WriteLine("otherout");
    }
}
class Sub : Super {
    public override void output()
    {
      System.Console.WriteLine("sub");
    }
    public void other()
    {
      output();
      base.output();
      otherout();
      //Super.otherout();//produces an Error
    }
}
using System;

class MainClass {
  public static void Main (string[] args) {
    var x = new Sub();
    x.other();
  }
}

/*
output is:
sub
super
otherout
*/

It demos that base seems to allow you to hit the subclass method and the superclass method.

Terribly sorry about leaving out the context. I didn't realize there were multiple ways to use "base." And thank you for the well written answer.

File MapLocation

namespace SameNamespace
{
  class MapLocation : Point(x, y)
  {
      public MapLocation(int x, int y) : base(x, y)
      {
      }
  }
}

I learned that "base is referring to the Point parent class to the constructor MapLocation. Thank you again for taking the time to help me learn this.