C# Calling variables from other classes

this is probably very simple, but I have always just made one big class and never tried make clean code. Now I am trying and experiencing errors..

So, this is the idea:

class1
{
    method1 { value 1; value 2 }
    method2 { value 3; value 4 }
    method3 { uses method4 from class2 }
}

class2
{
    method4 { uses values 1-4 from class1 }
}

I am doing it by calling: class1 c1 = new class1() in method4 and class2 c2 = new class2 in method3.

So this is what happens:

method1, method2 produce values 1-4
method3 calls class2 c2 = new class2
I get into class2, then into method4 and get null/0 values instead of what I made in first step.

Solution

Well, here is some code for you. I'm not sure it it's what you require. It might help you get started, though. You can try running it here: https://dotnetfiddle.net/#

This is Class1. It exposes some of its data via properties.

public class Class1
{
    // these are properties
    public int Value1 { get; set; }
    public int Value2 { get; set; }
    public int Value3 { get; set; }
    public int Value4 { get; set; }

    public void Method1()
    {
        Value1 = 1;
        Value2 = 2;
    }

    public void Method2()
    {
        Value3 = 3;
        Value4 = 4;
    }

    public void Method3()
    {
        // uses method4 from class2 
        var c = new Class2();
        c.Method4();
    }
}

This is Class2. It calls methods from Class1 and accesses its properties.

public class Class2
{
    public void Method4()
    {
        //uses values 1-4 from class1 
        var c = new Class1();

        c.Method1();
        c.Method2();

        Console.WriteLine(c.Value1);
        Console.WriteLine(c.Value2);
        Console.WriteLine(c.Value3);
        Console.WriteLine(c.Value4);
    }
}

This uses both closes and shows the result:

using System;

public class Program
{
    public static void Main()
    {
        var c1 = new Class1();      
        c1.Method3();
    }
}