response.redirect doesn't redirect to proper link

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ASP.NET

Hi,

In my website, I inherit each web page's class from a base class for checking session timeout

Partial Class Default
    Inherits SessionManagement
.
.
End Class

SessionManagement class looks as

Imports Microsoft.VisualBasic


Public Class SessionManagement
    Inherits System.Web.UI.Page

    Public m_bIgnoreSessionTimeout As Boolean = False
  

    Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
        Dim sPageName As String = String.Empty

        Try
            MyBase.OnInit(e)

            If m_bIgnoreSessionTimeout = True Then
                Exit Sub
            End If



            If Not Context.Session Is Nothing Then

                If Session.IsNewSession = True Then

                    Dim sCookieHeader As String = Request.Headers("Cookie")

                    If IsNothing(sCookieHeader) = False Then

                        If sCookieHeader.IndexOf("ASP.NET_SessionId") > -1 Then


                        
                            Session.Abandon()


                            
                            Response.Redirect("~/SessionTimeout.htm", False)
                            HttpContext.Current.ApplicationInstance.CompleteRequest()



                            'End If



                      

                    End If

                End If

            End If
        Catch ex As Exception
            Session.Abandon()

         
            Response.Redirect("~/SessionTimeout.htm", False)
            HttpContext.Current.ApplicationInstance.CompleteRequest()

        End Try
    End Sub


End Class

The sessiontimeout.htm page exists in the same folder as of default.aspx.

When the session expires or times out, the default page tries to go to sessiontimeout.htm but gives error 400

I right clicked on it and checked the url, it showed me

http://<webserver name="">/MyWebSite/%2fMyWebSite%2fsessiontimeout.htm

My question is why it did not try to redirect to the path as http://<webserver name="">/MyWebSite/sessiontimeout.htm and instead chose the path above by appending <sitename>/sessiontimeout.htm to the base url?

Thanks

Vijay