Partial Classes
The code that is generated by the designer can be customized by the developer.
All code-generated files have the extension "*.tt.cs" and should not be modified, as they will be overwritten the next time code is generated.
All code-generated classes are partial, and in this way, the code-generated class can be customized and, for example, override various methods or implement partial methods.
More info about partial class and methods: Partial Classes and Methods (C# Programming Guide)
To assist with customizing the application, the designer has "Code Tasks", which contain the most commonly used customizations.
"Code tasks" can be accessed in two ways: Via the "Configuration" tab or via the "Customization" tab.