How can I have a dynamic URL in generic class - vb.net

Question

I need to have a dynamic URL preferably from a Test Class. Can any one help me in formatting this design pattern to handle dynamic links from tests. instead of a constant HomePageURL.
Namespace TestDesign
Public Class HomePage
Inherits IE
Public Const HomePageURL As String = "testlink"
Public Sub New()
MyBase.New(HomePageURL)
End Sub
Public Sub New(ByVal instance As IE)
MyBase.New(instance.InternetExplorer)
End Sub
Public ReadOnly Property UserIDField() As TextField
Get
Return TextField(Find.ById(New Regex("txtuserName")))
End Get
End Property
Public ReadOnly Property PasswordField() As TextField
Get
Return TextField(Find.ById(New Regex("txtPassword")))
End Get
End Property
Public ReadOnly Property ContinueButton() As Button
Get
Return Button(Find.ById(New Regex("Submit")))
End Get
End Property
Public ReadOnly Property LogoutLink() As Link
Get
Return Link(Find.ById(New Regex("lnkLogout")))
End Get
End Property
Friend Sub Login(ByVal username As String, ByVal password As String)
UserIDField.TypeText(username)
PasswordField.TypeText(password)
ContinueButton.Click()
End Sub
Friend Sub Logout()
LogoutLink.Click()
End Sub
End Class
End Namespace

Answer 1

How I would approach this is to put the base url into the applicaiton config and then build a URLs class to construct them here is an example:
In app config
<appSettings>
<add key="TestServerUri" value="http://www.apple.com"/>
</appSettings>
in class file
public static Uri AppleHome
{
get
{
return new Uri(ConfigurationManager.AppSettings["TestServerUri"]);
}
}
public static Uri Iphone = new Uri(AppleHome, #"/iphone/");