Need to use Session State - vb.net

Question

VB student that needs some help with a simple two page application that:
1.) Create a sessions counter to show how many registrations are saved each time the "Submit" button is clicked
CODE FOR SESSION COUNT
If Not IsPostBack Then
If Session("key") Is Nothing Then
Session("key") = 0
Else
Session("key") = Session("key") + 1
End If
Response.Write(Session("key"))
LoadData()
End If
2.) Create a "Display" button that will show the above count on a new page when the user clicks it.
CODE TO DISPLAY SECOND PAGE WITH SESSION COUNT
Response.Redirect("PageTwo.aspx")
But nothing is displaying on the second page when I click the "Display" button. I have tried different ways to adjust my code but it doesn't work. Instead of me listing all of my changes and attempts I made I just listed my core code and need someone to please show me how I can get this to work.

Answer 1

I changed my IF Statement for the "Submit" button to something easier to work with and read.
Protected Sub SubmitButton_Click(sender As Object, e As EventArgs) Handles SubmitButton.Click
'if session is not set then set the session and assign value to 1
If (Session.Item("numberofRegistration") Is Nothing) Then
'setting session variable
Session.Item("numberofRegistration") = 1
Else
'taking value from session and incrementing value by 1
Session.Item("numberofRegistration") = Convert.ToInt32(Session.Item("numberofRegistration").ToString()) + 1
End If
End Sub
Then for my Display Button, a simple redirect to "PageTwo"
Protected Sub DisplayButton_Click(sender As Object, e As EventArgs) Handles DisplayButton.Click
Response.Redirect("PageTwo.aspx")
End Sub
On Page Two I used a Message Label and another IF statement
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'checking if session is set or not
If (Session.Item("numberofRegistration") Is Nothing) Then
'if session variable is null then
'display error message on the lable
MessageLabel.Text = "Please set the session variable"
Else
'display value from session variable on the lable with id=lblMessage
MessageLabel.Text = String.Format("Total Number of Registrations : {0}", Session.Item("numberofRegistration").ToString())
End If
End Sub