VB.net Query String

I am having a problem with Query Strings in a ASP.net application VB.net.

Here is a simplified version of the scenario:

URL: MyPage.aspx?QuoteNumber=12345

1) A user navigates to the page using a hyperlink in an email.
2) The page loads and pulls up the Quote from the Query String (Quote Number = 12345). Code looks like this:
       
        Dim QryStringFound As Integer
        Dim QuoteNumber As Integer

        QryStringFound = 0
        QuoteNumber = 0

        QuoteNumber = Request.QueryString("QuoteNumber")

        If QuoteNumber > 0 Then

            QryStringFound = 1

        End If

        If QryStringFound = 1 Then

            Me.txtQuote.Text = QuoteNumber

            'This code loads the Quote information using the Quote Number in the textbox.
            QuoteDetails()

        End If
3) The user decides to look at another quote, but when the page relaods the Query String, QuoteNumber=12345 is still there so it pulls up Quote Number 12345 again.

How do I make the QueryString only execute the first time the page is loaded?
yonbretAsked:
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guru_samiCommented:
You can check if page is postBack like below in your PageLoad:
If Not Page.IsPostBack Then
    'This is first time the page is loaded
    'execute your code here
End If
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