C# Tutorial for Beginners 22 - Properties in C# (How to Define Properti... 









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using System;
namespace MyProject.Examples
{
    public class Book
    {
        private int _id;
        private string _bookName;
        private int _noOfPAges=250;
        private string _auther;

  
        public string Auther{get; set;}
            

        public int Id
        {
            set
            {
                if (value < 0)
                    throw new Exception("Id not valid");
                this._id = value;
            }
            get {
                return this._id;
            }
        }
  


        public string BookName
        {
            set
            {
                if (string.IsNullOrEmpty(value))
                    throw new Exception("Book Name not valid or null");
                this._bookName = value;
            }
            get {
                return this._bookName;
            }
        }


        public int NoOfPAge
        {
            get
            {
                return this._noOfPAges;
            }
        }
    }
 

    class ExampleOne
    {
        public static void Main()
        {
         
            Book B1 =new Book();
            B1.Id=10;
            B1.BookName = "The C# Book";
            B1.Auther = "ProgrammingKnowldge";
            Console.WriteLine("The Book Id is {0}", B1.Id);
            Console.WriteLine("The Book Name is {0}", B1.BookName);
            Console.WriteLine("The Book Page is {0}", B1.NoOfPAge);
            Console.WriteLine("The Book Auther is {0}", B1.Auther);
            Console.ReadKey();
        }
    }
}














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Using Properties (C# Programming Guide)

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