ButtonSearchTyped.aspx
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Public ReadOnly Property SearchString() As String
Get
Return txtSearch.Text
End Get
End Property
</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>
ButtonSearchResultsTyped.aspx
<%@ Page Language="VB" %>
<%@ 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">
Sub Page_Load()
If Not IsNothing(Page.PreviousPage) Then
lblSearch.Text = String.Format("Search For: {0}", PreviousPage.SearchString)
End If
End Sub
</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>
Notice that the page ButtonSearchResultsTyped.aspx includes a PreviousPageType <%@ PreviousPageType %>directive. This directive casts the value returned by the PreviousPage property as an instance of the ButtonSearchTyped class. Without this directive, the PreviousPage property would return the previous page as an instance of the generic Page class.
