Problem about "IsCrossPagePostBack" Property.

condescendent · June 12th, 2007, 09:26 PM

On the textbook page 74, List 3-13. when I tried to run it. I can't get the label content on the second page. It always leads me to "Page1.aspx". Is there some problem with my code. I only changed the PostBackURl property on the first page. I changed to PostBackUrl="Page2 - Listing 03-13.aspx". Also, according to listing 3-13. I changed <%@ PreviousPageType VirtualPath="Page1 - Listing 03-11.aspx" %> field.

Any help will be greatly appreciated.

First page:

<%@ 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 pp_TextBox1() As TextBox
     Get
         Return TextBox1
     End Get
End Property

Public ReadOnly Property pp_Calendar1() As Calendar
     Get
         Return Calendar1
     End Get
End Property

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        Label1.Text = "Hello " & TextBox1.Text & "<br /><br />" & _
            "Date Selected: " & Calendar1.SelectedDate.ToLongDateString()
End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>First Page</title>
</head>
<body>
    <form id="form1" runat="server">
        Enter your name:<br />
        <asp:Textbox ID="TextBox1" Runat="server">
        </asp:Textbox>
        <p>
        When do you want to fly?<br />
        <asp:Calendar ID="Calendar1" Runat="server"></asp:Calendar></p>
        <br />
        <asp:Button ID="Button1" Runat="server" Text="Submit page to itself"
         OnClick="Button1_Click" />
        <asp:Button ID="Button2" Runat="server" Text="Submit page to Page2.aspx"
         PostBackUrl="Page2 - Listing 03-13.aspx" />
        <p>
        <asp:Label ID="Label1" Runat="server"></asp:Label></p>
    </form>
</body>
</html>

Second page:

<%@ Page Language="VB" %>
<%@ PreviousPageType VirtualPath="Page1 - Listing 03-11.aspx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<script runat="server">
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
     If Page.IsCrossPagePostBack Then
        Label1.Text = "Hello " & PreviousPage.pp_Textbox1.Text & "<br />" & _
            "Date Selected: " & _
            PreviousPage.pp_Calendar1.SelectedDate.ToShortDate String()
     Else
            Response.Redirect("Page1 - Listing 03-11.aspx")
     End If
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Second Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:Label ID="Label1" Runat="server"></asp:Label>
    </form>
</body>
</html>

I am a database programmer and .Net programmer