CSharp - Use static method to access static field

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Introduction

Consider the modified program.

Demo

using System;

class NonStaticClass
{
    static int myStaticVariable = 25;//static variable
    int myInstanceVariable = 50;//instance variable
                                //a static method
    public static void StaticMethod()
    {//from w w  w  . j  a  va  2  s .c  o  m
        Console.WriteLine("NonStaticClass.StaticMethod");
        Console.WriteLine("myStaticVariable = {0}", myStaticVariable);//25
                                                                      //Console.WriteLine("StaticMethod->instance variable = {0}",myInstanceVariable);//error
    }
    //a non-static method
    public void NonStaticMethod()
    {
        Console.WriteLine("NonStaticClass.NonStaticMethod");
        Console.WriteLine("NonStaticMethod->static variable = {0}", myStaticVariable);//25 Ok
                                                                                      //Console.WriteLine("myStaticVariable = {0}", this.myStaticVariable);//Error
        Console.WriteLine("myInstanceVariable = {0}", myInstanceVariable);//50
    }
}

class Program
{
    static void Main(string[] args)
    {
        NonStaticClass anObject = new NonStaticClass();
        anObject.NonStaticMethod();//Ok
                                   //anObject.StaticMethod();//Error
        NonStaticClass.StaticMethod();
    }
}

Result

Analysis

'this' is an instance reference.

static method cannot use this keyword.

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