What is difference in following two code snippents

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public List<Pizza> Pizzas { get; set; }  = new List<Pizza>();

Above is code line which is in one of books.
Below is code snippet written by me.
I am new to C# ,will anyone please help me
What is meaning of "=new List<pizza>()"
And what if I write like below?

public List<Pizza> pizzas
        {
            get { return pizzas; }
            set { pizzas = value; }
        }

What I have tried:

I found though net the down snippet

Posted 9-Aug-22 0:38am

adityarao31

Updated 9-Aug-22 1:58am

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Richard Deeming · Accepted Answer · 2022-08-09T01:58:00

The first snippet is a correct auto-property with an initializer:
Auto-Implemented Properties - C# Programming Guide | Microsoft Docs[^]

Auto properties have been around since C# 3; the property initializer syntax was added in C# 6.

The second snippet is a StackOverflowException waiting to happen. The property get method calls itself in an infinite recursion. The property set method does the same.

The correct implementation requires a field:

C#

private List<Pizza> _pizzas = new List<Pizza>(); 

public List<Pizza> Pizzas
{
    get { return _pizzas; }
    set { _pizzas = value; }
}

As you can see, that's a lot more code "ceremony" for exactly the same result.