error with Get and set

Question

I am trying to figure out how Get and set works, and i am getting a error and i dont really understand why.

constructor with get and set

class Accounts
{
public string Nameinfo;
public int Ageinfo;
public Accounts(string aName, int aAge, string aprice)
{
Nameinfo = aName;
Ageinfo = aAge;
Price = aprice;
}
public string Price
{
get { return Price; }
set {
if (value == "1" || value == "2" )
{
Price = value;
MessageBox.Show("good");
}
else
{
value = "0";
MessageBox.Show("not valid");
}
}
}
}

Button to activate the constructor

private void test_Click(object sender, RoutedEventArgs e)
{
Accounts accountss = new Accounts("jack", 2, "1");
MessageBox.Show(accountss.Nameinfo);
accountss.Price = textbox.Text.ToString();
}

Sachin Singh · Answer

An Object means a thing which has some specifications like how tall, how much price, what does he do etc. In programming , A constructor is , who creates object and defines default specifications untill it is parameterized , like ..okk the price is 10 and name is samsung etc. You can create a object (Obj1) only one time and afterwords you can only see it's specifications or set its specification , but how will you do that , so you need getter and setter, constructor just creates the object but doesn't help to set or get the specifications once it is created, note :- the specifications are always private , and you can't do anything on private property of someone. take below example public class Human { private int legs; private int height; public Human( int l, int h) { legs=l; height=h; } } now you can create an object of Human but after creating the object, you can not set how many legs he has neither you can get how many legs he really had. so you need getter and setter. public class Humans { private int _Height; public int Height { get { return _Height; } set { _Height = value; } } } Now you can put conditions on setter public class Humans { private int _Height; private bool IsNewlyBorn; public int Height { get { return _Height; } set { if (value == 0) { IsNewlyBorn = true ; _Height = value; } else { IsNewlyBorn = false ; _Height = value; } } } }

Amit Gupta · Answer

Auto get set properties can't work like this. If you have condition then you have to store the value to a private variable like below decimal _price; public decimal Price { get { return _price; } set { if (value == 1 || value ==2 ) { _price = value; MessageBox.Show("good"); } else { // value = "0"; //not necessary MessageBox.Show("not valid"); } } }