Csharp/CSharp Tutorial/Class/private

Define private constructors to make a singleton

public class MyClass
{
    static MyClass cache = null;
    static object cacheLock = new object();
    private MyClass()
    {
        // useful stuff here
    }
    
    public static MyClass GetMyClass()
    {
        lock(cacheLock)
        {
            if (cache == null)
            cache = new MyClass();
            
            return(cache);
        }
    }
}

private static and const Fields

using System;
    class MainClass
    {
        static void Main(string[] args)
        {
            MyTV tv = new MyTV();
        }
    }
    public class MyTV
    {
        public MyTV()
        {
            channel = 2;
        }
        private static int channel = 2;
        private const int maxChannels = 200;
    }

Use Properties to get and set private member variable

using System;
class Circle{
    int radius;
    
    public int Radius{
        get{
            return(radius);
        }
        set{
            radius = value;
        }
    }
}
class MainClass
{
    public static void Main()
    {
        Circle c = new Circle();
        c.Radius = 35;
    }
}

Using Methods to change private fields

using System;
  class Class1
  {
    static void Main(string[] args)
    {
            MyCar car = new MyCar();
            int refChan = 0;
      int chan = 0;
            car.GetSpeed( chan );
            car.GetSpeed( ref refChan );
    }
  }
  public class MyCar
  {
        private static int speed = 2;
        private const int maxSpeed = 200;
        
        public bool ChangeSpeed(int newSpeed)
        {
            if( newSpeed > maxSpeed )
                return false;
            speed = newSpeed;
            return true;
        }
        public void GetSpeed( int param )
        {
            param = speed;
        }
        public void GetSpeed( ref int param )
        {
            param = speed;
        }
  }