ContainerExpressions provides generic abstractions to remove boilerplate code needed by all programs.
Containers have some utility that extends the underlying type (any T).
Expressions are designed to work on top of containers, helping in common use cases; or quality of life when connecting code...
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This is the Page builder Container Kentico Xperience 13 MVC.Net Core. You must install PageBuilderContainers.Kentico on the admin/mother application along with this.