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Listing 2.22 - ButtonSearchTyped.aspx

Illustrates how to perform cross page posts with typed access to the previous page.

Listing 2.22 - ButtonSearchTyped.aspx (C#)
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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    public string SearchString
    {
        get { return txtSearch.Text; }
    }

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Button Search Typed</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblSearch"
        Text="Search:"
        Runat="server" />
    <asp:TextBox
        id="txtSearch"
        Runat="server" />
    <asp:Button
        id="btnSearch"
        Text="Go!"
        PostBackUrl="ButtonSearchResultsTyped.aspx"
        Runat="server" />
    </div>
    </form>
</body>
</html>

When you submit the form above, the form posts to the following page.

Listing 2.23 - ButtonSearchResultsTyped.aspx (C#)
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<%@ Page Language="C#" %>
<%@ PreviousPageType VirtualPath="ButtonSearchTyped.aspx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    void Page_Load()
    {
        if (Page.PreviousPage != null)
        {
            lblSearch.Text = String.Format("Search For: {0}", PreviousPage.SearchString);
        }
    }
    
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Button Search Results Typed</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblSearch"
        Runat="server" />
    
    </div>
    </form>
</body>
</html>