asp.net, back button, fields blanked

In asp.net, on a page A, if a user enters a text input value, goes forward, and then later, using back button, goes back to that page A, is there any way to blank out that field, by knowing that they got to it on a back button?
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codequestAsked:
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HainKurtSr. System AnalystCommented:
or something like this

Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1))
Response.Cache.SetCacheability(HttpCacheability.NoCache)
Response.Cache.SetNoStore()

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or this in aspx page

<meta http-equiv=expires content=-1>
<meta http-equiv=Cache-Control CONTENT=no-cache>
<meta http-equiv=Pragma CONTENT=no-cache>

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HainKurtSr. System AnalystCommented:
add this to your control (aspx)

EnableViewState="false"
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HainKurtSr. System AnalystCommented:
or on page_load, add this

If Not IsPostBack
  myInput.text=""
End If
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codequestAuthor Commented:
Thanks for responding.  Hmm....Tried both, no joy.

        <asp:TextBox  runat="server"
            ID="f155_PrtcLoginOnlineIDInput"
            cssclass ="f155_PrtcLoginOnlineIDInput"
            enableviewstate ="false"
            />

In page load:
        If Not IsPostBack Then
            Me.f155_PrtcLoginOnlineIDInput.Text = ""
            (and other stuff)

To make sure I've described the scenario properly, I enter text into f155_PrtcLoginOnlineIDInput, and press a button that redirects to another page.

When I hit the back key, the text is still in the f155_PrtcLoginOnlineIDInput field.

I'm trying to make the text be gone when arrive at the page through the back key.
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HainKurtSr. System AnalystCommented:
looks like this is nothing to do with code, but cache issue...

add this to your page

Response.Cache.SetCacheability(HttpCacheability.NoCache)
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codequestAuthor Commented:
Thanks, I'll try those.  Where might I put the Response.Cache statements...in Page Load?
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HainKurtSr. System AnalystCommented:
anywhere... page_PreRender is a good place... most of the time it is empty...
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codequestAuthor Commented:
The Response.Cache statements worked in a test program, and I won't be able to put more time into this for a while, so I'm going to accept the answer.    Thanks!
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