If we use one common programming language for multiple mobile platforms (and even server platforms), then we can share a lot of code between our target platforms, as illustrated in the following diagram. All code that isn't related to the target platform can be shared with other .NET platforms. Code that is typically shared in this way includes business logic, network calls, and data models:
There is also a large community based around the .NET platforms, as well as a wide range of third-party libraries and components that can be downloaded from NuGet (https://nuget.org) and used across the .NET platforms.
Code sharing across platforms leads to shorter development times. It also produces apps of a higher quality because, for example, we only need to write the code for business logic once. There is a lower risk of bugs and are also be able to guarantee that a calculation returns the same result, regardless of what platform our users use.
