Lesson 2-2, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Rectangle rect = new Rectangle();
            rect.Length = 10.0;
            rect.Width = 20.0;
            double area = rect.GetArea();
            Console.WriteLine("Area of Rectangle: {0}", area);
        }
    }
    public class Rectangle
    {
        public double length;
        public double width;
        public double Length
        {
            get
            {
            return length;
            }
            set
            {
            if (value > 0.0)
                length = value; 
            }
        }
        public double Width
        {
            get
            {
            return width;
            }
            set
            {
            if (value > 0.0)
            
               width = value; 
            }
        }
        public double GetArea()
        {
            return length * width;
        }
        
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 11 Mb, average nr of threads: 2