What is the meaning of “this” in C#

Question

Could anyone please explain the meaning \"this\" in C#?

Such as:

// complex.cs
using System;

public struct Complex 
{
   public int real;
   public          


        

Answer 1

The this keyword refers to the current instance of the class and is also used as a modifier of the first parameter of an extension method.

this (C# reference) - MSDN
C# Keywords - MSDN