Cross-Page PostBack in asp.net

Hi,
I try to use cross-page postback - its not working can you find where i made the mistake?

Page One: adultreg.aspx
Created simple registration form:

<asp:TextBox ID="txtfnm" runat="server" CssClass="txtbox" Text="sen">
<asp:TextBox ID="txtlnm" runat="server" CssClass="txtbox" Text="web">

on submit button:
stored in database and

Response.Redirect("regconfirmation.aspx")

Page Two: regconfirm.aspx
Design:

<%@ PreviousPageType VirtualPath="~/adultreg.aspx" %>
<asp:Label ID="lblname" runat="server" Text=""></asp:Label>

Code:

Public Partial Class WebForm6
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        lblname.Text = "Hi "
        If Not Page.PreviousPage Is Nothing Then
            Dim sourcetextbox As TextBox
            sourcetextbox = CType(PreviousPage.FindControl("txtfnm"), TextBox)
            If Not sourcetextbox Is Nothing Then
                lblname.Text = lblname.Text & UCase(sourcetextbox.Text)
            End If
        End If

        If Not Page.PreviousPage Is Nothing Then
            Dim srctextbox As TextBox
            srctextbox = CType(PreviousPage.FindControl("txtlnm"), TextBox)
            If Not srctextbox Is Nothing Then
                lblname.Text = lblname.Text & " " & UCase(srctextbox.Text)
            End If
        End If

        lblname.Text = lblname.Text & " , your signup is completed successfully." & vbLf & "We will get back to you shortly." & vbLf & "Thanks for registering with us."

    End Sub

End Class

Result shows:
Hi , your signup is completed successfully. We will get back to you shortly. Thanks for registering with us.

Expected Result:
Hi , SEN WEB your signup is completed successfully. We will get back to you shortly. Thanks for registering with us.

Where i made the mistake ?