Hi,
The page cannot remove it's own cache because it was already Cached itself. You need another page to clear the page's Output Cache
Here is my working sample code:
1. OutputCached.aspx
<%@ Page Language="VB" Debug="true" ContentType="text/html" ResponseEncoding="iso-8859-1" %>
<%@ OutputCache Duration="3600" Location="Server" VaryByParam="none" %>
<html>
<head>
<title>This page is from OutputCache</title>
</head>
<body>
<h1><%=Now()%></h1>
</body>
</html>
2. ClearOutputCache.aspx
<%@ Page Language="VB" Debug="true" ContentType="text/html" ResponseEncoding="iso-8859-1" %>
<script runat="server">
Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Dim path As String
path="/AbosoluteVitualPath/OutputCached.aspx"
HttpResponse.RemoveOutputCacheItem(path)
End Sub
</script>
<html>
<head>
</head>
<body>
<p>Clear Output Cache</p>
<form id="Form1" method="post" runat="server">
<asp:Button id="Button1" OnClick="Button1_Click" runat="server" Text="Button"></asp:Button>
</form>
</body>
</html>
The path should be the virtual absolute path to the items that are removed from the cache accroding to MSDN.