Loosing Session variable value on Response.Redirect method

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VB

ASP.NET

Hello Everyone,

There is one problem regarding Page Redirection. Here is Sample code
1) Database Connection -> Done
2) Insert Data -> Done
3) Add value inside Session variable -> Done
4) Redirect to success page -> Problem come up Here :(

Default1.aspx:

......
Dim success As String = "Success"
......
'btn_Click Event
    Try
        sqlCom.ExecuteNonQuery()
        sqlCon.Close()
        Session("success") = success
        MsgBox(Session("success") 'Msg Prints Properly

        modifyXmlData(filePath); ' Modifies the attribute value
        '1st Approach
        Response.Redirect("default2.aspx", False)
        '2st Approach
        'Server.Execute("default2.aspx", False)
        Catch ex As Exception
        MsgBox("Exception" + ex.Message)
        'lbl_Success.Text = ex.Message
    End Try
End Sub

Protected Sub modifyXmlData(ByVal filepath As String)
        Dim strPath = Server.MapPath(filepath)
        Dim xmlFile = XDocument.Load(strPath)

        xmlFile.<root>.<ListItem>.Where(Function(f) _
                        f.@value = ddl_SelectedValue).@visited = "Yes"
        xmlFile.Save(strPath)
End Sub

defualt2.aspx

inside page_Load()
'MsgBox(System.Web.HttpContext.Current.Session("success")) ' o/p : Empty
Dim success As String = Session("success").toString
MsgBox(success) 'o/p : Empty
End Sub

1st Approach : Using Response
It Redirects to next Page properly but when I am trying to get Session value
It Shows Empty always..

2nd Approach : Using Server
I am afraid with this option, because It holds the session value and at the time of redirection it executes the Page_Load event of Default2.aspx but after page_load Control get destroyed and stays on my Default1.aspx (first page)

instead of Server.Execute I used Server.Transfer but it raise the Exception -" thread is being aborted"

Thanking you
Please show me way to rectify this problem