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HttpCachePolicy.SetVaryByCustom Method

Specifies a custom text string to vary cached output responses by.

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

public void SetVaryByCustom(
	string custom


Type: System.String

The text string to vary cached output by.


custom is null.


The SetVaryByCustom method has already been called.

SetVaryByCustom is introduced in the .NET Framework version 3.5. For more information, see .NET Framework 3.5 Architecture.

How to: Cache Versions of a Page Using Custom StringsBuilding ASP .NET Web Applications
How to: Cache Versions of a Page Using Custom StringsBuilding ASP .NET Web Applications

The following code example demonstrates how to set the custom vary string to "Accept-Charset", which causes the origin-server's cache to choose one of several cached responses depending on the browser's Accept-Charset header.


Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

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

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