docs/basics/user-interface/introduction-to-xaml

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docs/basics/user-interface/introduction-to-xaml

In addition to a XAML file, most Avalonia controls also have a code-behind file that is commonly written in C#. The code-behind file by convention has the file extension .axaml.cs and is often displayed nested below the XAML file in your IDE.

https://docs.avaloniaui.net/docs/basics/user-interface/introduction-to-xaml