using System;

​

var product = new Product()

{

    Name = "product",

    Weight = 40

};

​

var deliveryPrice = product.Weight switch

{

    < 30 => 0,

    >= 30 and < 50 => 20,

    >= 50 => 100

};

​

Console.WriteLine(deliveryPrice);

​

​

class Product

{

    public string Name { get; set; }

​

    public decimal Weight { get; set; }

}