In C# 7, they've expanded the range of places that you can throw errors from, and the types of errors with useful objects like this one that you can catch. If you were to open this code inside of an older version of Visual Studio, then it wouldn't build at all. So this is a great new feature to have. In the next, and final, chapter of the book we'll return to tuples and take a deeper dive into how they work and some more advanced things you can do with them.
Germany
Slovakia
Canada
Brazil
Singapore
Hungary
Philippines
Mexico
Thailand
Ukraine
Luxembourg
Estonia
Lithuania
Norway
Chile
United States
Great Britain
India
Spain
South Korea
Ecuador
Colombia
Taiwan
Switzerland
Indonesia
Cyprus
Denmark
Finland
Poland
Malta
Czechia
New Zealand
Austria
Turkey
France
Sweden
Italy
Egypt
Belgium
Portugal
Slovenia
Ireland
Romania
Greece
Argentina
Malaysia
South Africa
Netherlands
Bulgaria
Latvia
Australia
Japan
Russia