C# error while calling class

Question

I learned basic and now I want to learn OOP in C# I have this code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace uceni_cs
{
    class Zdravic
    {
        public void pozdrav()
        {
            Console.WriteLine("Ahoj světe ! ");
        }
    }

}

But when I try to call it using this code

namespace uceni_cs
{
    class Zdravic
    {
        public void pozdrav()
        {
            Console.WriteLine("Ahoj světe ! ");
        }
    }
    Zdravic trida = new Zdravic();
}

In code Zdravic trida = new Zdravic(); is error. A namespace cannot directly contain members such as fields or methods. What I am doing wrong ? I just want to call the class. Thanks

You're instantiating a class outside of a class (inside of the namespace itself). You cannot do this. You need to instantiate it within another class somewhere. — ThePerplexedOne
– ThePerplexedOne, Commented Sep 30, 2016 at 10:54
You cannot simply write executable statements on namespace or class level. This can only be done on method level. Try creating a new console application and call the line Zdravic trida = new Zdravic(); in the Main method when having written your class. — Michael Würthner
– Michael Würthner, Commented Sep 30, 2016 at 10:55
c# does not allow you to create global data and function within namespace. you can create objects and function in class or main methods — Muhammad Nasir
– Muhammad Nasir, Commented Sep 30, 2016 at 10:56

YuvShap · Accepted Answer · 2016-09-30 12:29:48Z

3

In C# there is no such a thing global variable so you can't just create new instance of Zdravic type that does not belong to any class.

I suggest you to read General Structure of a C# Program, and c# Classes and Structs.

edited Sep 30, 2016 at 12:29

answered Sep 30, 2016 at 10:56

YuvShap

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Comments

Hristo Kolev · Accepted Answer · 2016-09-30 10:58:38Z

1

You need to create an entry point to your application and instantiate the class there.

class EntryPoint
{
    static void Main()
    {
        Zdravic trida = new Zdravic();

        trida.pozdrav();
    }
}

answered Sep 30, 2016 at 10:58

Hristo Kolev

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Comments

hsehb · Accepted Answer · 2016-09-30 11:32:47Z

0

Create your class object in main method and then use the class properties using that object.

 Zdravic trida = new Zdravic();

in main method of you program/application.

answered Sep 30, 2016 at 11:32

hsehb

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