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Session Persist From Classic ASP to ASP.NET

Session Persist From Classic ASP to ASP.NET

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CamoDeveloper
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17 Jul, 2009 - 06:39 PM

Post #1

Do you have a classic ASP application running along side with .NET and need to share sessions across? Well here is a simple solution to that problem. I recently ran into this problem while working on a clients site, it is written in classic ASP but I'm converting it to .NET. He requested a page that required the session variable from the login page on the classic side. After hours of research, here is what I have come up with and it works perfectly.

I have a common.asp page that I include into the pages that hold all of the code I use frequently. The easiest way I could find how to do this was make a form that was submitted by javascript. First, make a .NET page that the session variables will be sent to. Name it whatever you like, but I'm going to use "persist-session.aspx" Now, in the classic page make a sub and name it whatever you want. I'm naming mine PersistSessionToDotNet. Add a parameter to the sub that we will pass the destination url we want to navigate to after persisting to .NET.

CODE

Sub PersistSessionToDotNet(DestURL)
End Sub

Now, declare a variable with any name you want. I'm going to use the generic name "var"

CODE

Sub PersistSessionToDotNet(DestURL)
Dim var
End Sub

Now, do a Response.Write to begin the form.

CODE

Sub PersistSessionToDotNet(DestURL)
    Dim var

    Response.Write("<form name=""sessionpersist"" id=""sessionpersist"" action=""classic-asp-session-persist.aspx"" method=""post"">")
End Sub

Next, loop through the session variables that you are wanting to be persisted.

CODE

Now, put in a hidden variable for the page you want to navigate to.

CODE

Sub PersistSessionToDotNet(DestURL)
    Dim var

    Response.Write("<form name=""sessionpersist"" id=""sessionpersist"" action=""classic-asp-session-persist.aspx"" method=""post"">")
    For Each var In Session.Contents
        Response.Write("<input type=""hidden"" name=""" & var & """ value=""" & Session.Contents(var) & """>")
    Next
    Response.Write("<input type=""hidden"" name=""destination"" value=""" & DestURL & """>")
End Sub

Then, we close the form and submit it through javascript and end the stream

CODE

Now that we have the classic ASP done you just need to make the .NET page retrieve it the session variables. We put this in the Page_Load. For this, we just loop through the variables then send the user on their way using the url we put as the parameter.

CODE

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    For i As Integer = 0 To Request.Form.Count - 1
        Session(Request.Form.GetKey(i)) = Request.Form(i).ToString
    Next
    Response.Redirect(Session("Destination").ToString)
End Sub

And that's that. A short, sweet, easy way to pass session data from ASP to .NET

~Camo