Compiler Error CS0120

Question

I'm trying to understand concept "class" and write some easy program. But my function Check() is not correct. Please follow me to the right side..

namespace ConsoleApplication2
{
    public class Task
    {
        public string RusVer { get; set; } 
        public string Key { get; set; } 
        public string UserVer { get; set; }


        public void Check()
        {
            if (UserVer == Key)
                Console.WriteLine("Good");            
        }
    }

class Program
{
    static void Main(string[] args)
    {

        Task p1 = new Task();
        p1.RusVer = "Привет, Мир!";
        p1.Key = "Hello, World!";
        Console.WriteLine(p1.RusVer);
        Console.WriteLine("Translate it: ");
        p1.UserVer = Convert.ToString(Console.ReadLine());
        Console.WriteLine(p1.UserVer);

        Task.Check(); //errorCS0120

    }
}
}

score 6 · Accepted Answer · answered Oct 19 '13 at 20:21

6

You're calling Check as if it was static method. It is instance method so it should called p1.Check().

answered Oct 19 '13 at 20:21

empi

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then p1 - is a instance method? And if i write public static void Check() i must calling Task.Check()? – Eluvium Oct 19 '13 at 20:29
Check is an instance method (method called on instance of a type). p1 is an instance. – empi Oct 19 '13 at 20:30

Sachin · Answer 2 · 2013-10-19T20:29:41.383

Compiler Error CS0120: An object reference is required for the nonstatic field, method, or property 'member'

So In order to use a non-static field, method, or property, you must first create an object instance of a class

You need to call it with the help of Task class object

p1.Check();

If you declared Check() method as static then you can call it as you are currently doing.

 public static void Check()
 {
    if (UserVer == Key)
        Console.WriteLine("Good");            
 }

Compiler Error CS0120

2 Answers2

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