using System;
public class Program
{
public static void Main()
var foo = new Foo();
foo.Total += 7;
Console.WriteLine(foo.Total?.ToString() ?? "OMG");
var bar = new Bar();
bar.Total += 7;
Console.WriteLine(bar.Total?.ToString() ?? "WTF");
}
public class Foo
public decimal? Total { get; set; }
public class Bar
public decimal? Total { get; set; } = 7m;