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copied!<p>The important thing to note here is that if your VaryByCustom changes, asp.net stores a separate cached version of the page. </p> <p>So, supposing your VaryByCustom-"custom1" with Duration="60" then this will be cached for 60 seconds. </p> <p>In between if your VaryByCustom changes to "custom2" with duration="60" asp.net will store a separate copy in the cache, which is different from the cache of "custom1" and this separate version will be cached for 60 seconds. </p> <p>An easy way to test this is by changing VaryByCustom based on browser. </p> <p>In Global.asax</p> <pre><code>public override string GetVaryByCustomString(HttpContext context, string custom) { if (custom == "browser") { string browserName; browserName = Context.Request.Browser.Browser; browserName += Context.Request.Browser.MajorVersion.ToString(); return browserName; } else { return base.GetVaryByCustomString(context, custom); } } </code></pre> <p>Aspx</p> <pre><code><%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebFormsPlayGround._Default" %> <%@ OutputCache Duration="40" VaryByParam="None" VaryByCustom="browser" %> </code></pre> <p>Page load</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { lblTime.Text = "The time now is: <br/>"; lblTime.Text += DateTime.Now.ToString(); } </code></pre> <p>I havent included the markup for asp:Label in the aspx, but I hope you get the general idea.</p>

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