VB.NET properties not seen by c#

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C#3.0

C#

I have a vb.net class I am using in C# for AD authentication. My problem is its not able to read my properites for the user in C#. What would be the properway to fix it in VB.NET to make it seen or can someone provide an example in C# of how I could rewrite it?

Its a VB.NET class but it seems to access most if not all but can't seem to retrieve the _theUser. It's always null even though I can access the ADSecurity.UserCredentials class and view some the items in the Class. Could it also be that maybe Session is not being populated? Meaning Session["thisUser"]is not defined or defined correctly?

Public ReadOnly Property UserId() As String
Get
Return _userId
End Get
End Property
The following C# is where it can't see the user properties and comes back with _theUser as null.

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

_theUser = (ADSecurity.UserCredentials)Session["thisUser"];
if (_theUser.IsValidUser)
{
if (_theUser.IsAdminGroup | _theUser.IsManagersGroup | _theUser.IsProjManagersGroup | _theUser.IsProduction | _theUser.IsSales | _theUser.IsFlight | _theUser.IsSupport)
{


}