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HttpCachePolicy::SetValidUntilExpires Method

Specifies whether the ASP.NET cache should ignore HTTP Cache-Control headers sent by the client that invalidate the cache.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public:
void SetValidUntilExpires(
	bool validUntilExpires
)

Parameters

validUntilExpires
Type: System::Boolean
true if the cache ignores Cache-Control invalidation headers; otherwise, false.

The SetValidUntilExpires method is set to true automatically when the high-level <%@ OutputCache … %> page directive is used.

This method is provided because some browsers, when refreshing a page view, send HTTP cache invalidation headers to the Web server and evict the page from the cache. When the validUntilExpires parameter is true, ASP.NET ignores cache invalidation headers and the page remains in the cache until it expires.

SetValidUntilExpires is introduced in the .NET Framework version 3.5. For more information, see .NET Framework Versions and Dependencies.

The following code example demonstrates how to use the SetValidUntilExpires method to instruct that any cache invalidation headers sent by the client are ignored.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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