System.Web (system.web.dll)delegate

A function with this signature can be used for the AddValidationCallback( ) method of the HttpCachePolicy class. Using this method gives you the opportunity to check other dependencies that a cached page may have and either allow the page to be served or invalidate it and require the page to be recompiled. To invalidate a page, set the validationStatus parameter to HttpValidationStatus.Invalid.

public delegate void HttpCacheValidateHandler(HttpContext context, object data, 
        ref HttpValidationStatus validationStatus);

Passed To

HttpCachePolicy.AddValidationCallback( )

    Part I: Introduction to ASP.NET
    Part III: Namespace Reference
    Chapter 40. The System.Web.UI.MobileControls Namespace
    Chapter 42. The System.Web.UI.WebControls Namespace