Using ChildActionOnly in MVC

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The ChildActionOnly attribute ensures that an action method can be called only as a child method
from within a view. An action method doesn’t need to have this attribute to be used as a child action, but
we tend to use this attribute to prevent the action methods from being invoked as a result of a user
request.
Having defined an action method, we need to create what will be rendered when the action is
invoked. Child actions are typically associated with partial views, although this is not compulsory.

  1. [ChildActionOnly] allowing restricted access via code in View

  2. State Information implementation for specific page URL.
    Example: Payment Page URL (paying only once)
    razor syntax allows to call specific actions conditional

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