缓存对象似乎未设置

Question

请参阅以下代码：

Public Class _Default
    Inherits Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        Using outputFile As New IO.StreamWriter("c:\log.txt", True)
            outputFile.WriteLine("Got here")
        End Using
        If Request.QueryString("id") = "1" Then
            TextBox1.Text = "id1"
        ElseIf Request.QueryString("id") = "2" Then
            TextBox1.Text = "id2"
        End If
    End Sub
End Class

以及以下代码：

Public Class Test
    Inherits System.Web.UI.Page
    Private Sub page_Load(sender As Object, e As EventArgs) Handles form1.Load
        SendPageRequest()
    End Sub
    Private Sub SendPageRequest()
        Dim proxy As New Net.WebProxy
        Dim webReq As Net.HttpWebRequest = CType(Net.WebRequest.Create("http://localhost:58722/Default.aspx?id=1"), Net.HttpWebRequest)
        If proxy IsNot Nothing Then webReq.Proxy = proxy
        Using webResp As Net.HttpWebResponse = CType(webReq.GetResponse(), Net.HttpWebResponse)
            'Get the response, then close it as we don't actually need anything but   to send the request.
        End Using
    End Sub
End Class

和下面的代码（default.aspx）：

<%@ Page Title="Home Page" Language="VB" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.vb" Inherits="Caching._Default" %>
<%@ OutputCache Duration="60" VaryByParam="None" %>


    <asp:Content ID="MainContent" ContentPlaceHolderID="MainContent" runat="server">
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</asp:Content>

我首先导航到：test.aspx，然后导航到default.aspx。

当我访问它时（访问test.aspx之后），我没有将任何查询字符串参数传递给default.aspx。但是，文本框为空，表示我访问test.aspx时未设置缓存。这是为什么？