Aspx page deployment on IIS V7 Postback redirect to another page doesn't work

Question

I Have 2 Pages of ASP V4.5 which are Login.aspx as a starting page and contentMainpage.aspx. It's working when I've tested on debug mode in visual studio 2012, but when I try to deploy it on IIS the button log in is not responding redirect to another page. The problem can be on web configuration I try to google it for 2 days and can not get the solution right. Please help. here the code bellow:

Imports PurchaseOrderList.Class1
Public Class Login
    Inherits System.Web.UI.Page
    Dim abmPO As New ServiceReference1.Service1SoapClient
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Session("LoginName") = ""
    End Sub
    Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Try
            If IsPostBack Then
                Dim LoginAutentif As New PurchaseOrderList.Class1
                If (LoginAutentif.ValidatePassword(Trim(TxtLoginName.Text), Trim(TxtPassW.Text))) = 0 Then
                    LblErrorMessage.Visible = True
                    LblErrorMessage.Text = "Invalid User Name or User Password"
                    Exit Sub
                Else
                    If (Response.IsClientConnected) Then
                        Response.Redirect("~/PurchaseOrderHeaders.aspx", False)
                        Session("LoginName") = TxtLoginName.Text
                    End If
                End If
            End If
        Catch ex As Exception
        End Try
    End Sub   
End Class 

Answer 1

Maybe try to "return Response.Redirect". I had this problem in MVC5.

Answer 2

Your issue is most likely to do with this line:

If (Response.IsClientConnected) Then

Quick google suggests there may be a few issues with IIS7/7.5 and using this property. Also I don't think it's really necessary here, it would make more sense being used in a long running routine to detect a client disconnect or timeout.

Try changing you button click to the following and see how you go.

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Try
        If IsPostBack Then
            Dim LoginAutentif As New PurchaseOrderList.Class1
            If (LoginAutentif.ValidatePassword(Trim(TxtLoginName.Text), Trim(TxtPassW.Text))) = 0 Then
                LblErrorMessage.Visible = True
                LblErrorMessage.Text = "Invalid User Name or User Password"
                Exit Sub
            Else
                Session("LoginName") = TxtLoginName.Text
                Response.Redirect("~/PurchaseOrderHeaders.aspx", True)
            End If
        End If
    Catch ex As Exception
    End Try
End Sub