Why my session used in another page is empty?

[zeejay]

On the Default.aspx

Dim i As Integer
        Dim array1 As ArrayList = New ArrayList()
        For i = 0 To cbBrand.Items.Count - 1
            If cbBrand.Items(i).Selected Then
                array1.Add(cbBrand.Items(i).Value)
            End If
        Next
        Session("array2") = array1
        Dim city As ArrayList = CType(Session.Item("array2"), ArrayList)
        For i = 0 To city.Count - 1
            Label1.Text += city(i)
        Next

On the Email2.aspx.cs

 
ArrayList array3 = (ArrayList)Session["array2"];
            for (int i = 0; i < array3.Count; i++)
            {
                Label1.Text += array3[i];
            }

There is no value in the array3 in the Email2.aspx.cs

[Frinavale]

Looks you have 2 different asp.net web applications here: one is in VB.NET and the other is in C#. Session does not span across different applications. You could try changing your Session to be something where both applications have access to the same data. See this article on Session for more information on the different types of session that you can use.

-Frinny