Page Lifecycle ASP.Net Tutorial

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<%@ Page Language="vb" %>
<%@ OutputCache Duration="300" VaryByParam="None" %>

   
      Adding a cache dependency in ASP.NET
      
         Sub Page_Load()
            Response.AddCacheItemDependencies("Key1")
            myMessage.Text = DateTime.Now()
         End Sub
         Sub Button1_Click(sender As Object, e As EventArgs)
            Cache("Key1") = "foo"
         End Sub