Start.cs:
---------
using System;
using System.Windows.Forms;
 
namespace Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        static void Main(string[] args)
        {
            Uruchom();
        }
 
        public static void Uruchom()
        {
            Book written = new Book();
            Book bought = new Book();
            written.Author = "Test";
        }
    }
}
 
Variables.cs:
-------------
using System;
using System.Collections.Generic;
using System.Text;
 
namespace Test
{
    public class Book
    {
        public string Title;
        public string Author;
        public short YearPublished;
        public int NumberOfPages;
        public char CoverType;
    }
}
 
Checking.cs:
------------
using System;
using System.Collections.Generic;
using System.Text;
 
namespace Test
{
    private class Outside
    {
        private void SomethingElse()
        {
            Book written = new Book();
 
            Console.WriteLine("Author: {0}",written.Author);
        }
    }

namespace Test
{
    public class Book
    {
        public string Author;
 
        public string ZmienCiag
        {
            get
            {
                return Author;
            }
 
            set
            {
                Author = value;
            }
        }
    }
}

        public static void Uruchom()
        {
            Book written = new Book();
            Book bought = new Book();
            written.Author = "Test";
        }

File Obliczenia.cs
------------------
namespace Test
{
    public partial class Obliczenia : Form
 
    // all variables made public
    {
        FixedString FixLength = new FixedString();
    }
}
 
File FixedString.cs
----------------------
namespace Test
{
     // here i put procedure which not use variables from other classes
     class FixedString 
    {
    }
}
 
File Track.cs
-------------
namespace Test
{
    public partial class Obliczenia : Form
}
 
File Cells.cs
-------------
namespace Test
{
   public partial class Obliczenia : Form
}