You want a constraint that the user can set a value if the intended value lies between 10 and 25.
Otherwise, the system will retain the previous value.
using System; class MyClass/*ww w .j a v a 2s .c om*/ { private int myInt; // also called private "backing" field public int MyInt // The public property { get { return myInt; } set { /*Imposing a condition: value should be in between 10 and 25. Otherwise, you'll retain the old value*/ if ((value >= 10) && (value <= 25)) { myInt = value; } else { Console.WriteLine("The new value {0} cannot be set", value); Console.WriteLine("Please choose a value between 10 and 25"); } } } } class Program { static void Main(string[] args) { MyClass ob = new MyClass(); //ob.myInt = 10;//Error: myInt is inaccessible //Setting a new value ob.MyInt = 10;//Ok.We'll get 10 //Reading the value Console.WriteLine("\nValue of myInt is now:{0}", ob.MyInt); //Setting another value to myInt through MyInt ob.MyInt = 100; Console.WriteLine("Now myInt value is:{0}", ob.MyInt);//100 } }