Gets or sets the OutputCacheProfile.VaryByCustom property.
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The OutputCacheProfile.VaryByCustom can be any text that represents custom output-caching requirements. If a custom string is entered, you must override the System.Web.HttpApplication.GetVaryByCustomString(System.Web.HttpContext, string) method in the application's Global.asax file.
The OutputCacheProfile.VaryByCustom settings are the same ones used by the VaryByCustom attribute of the @ OutputCache directive.