get,set and value keyword in c#.net

Question

What is value keyword here and how is it assigning the value to _num? I\'m pretty confused, please give the description for the following code.

Answer 1

Properties are the way you can READ, WRITE or COMPUTE values of a private field or class variable. The set or setter inside a property is used when the code assigns a value into the private field or (class) variable. The value keyword means simply "the thing that is being assigned".

    public class StaffMember 
    { 
        private int ageValue; 
        public int Age 
            { 
                 set 
                     { 
                         if ( (value > 0) && (value < 120) ) 
                             { this.ageValue = value; } 
                     } 
                 get { 
                      return this.ageValue; 
                     } 
            } 
    }
//Rob Miles - C# Programming Yellow Book