I ended up finding the solution on some other forums, but I made some improvements and I wanted to put it all together in one place for everyone.

add the following script to the top of

<script runat="server">

Sub change(ByVal sender As Object, ByVal e As EventArgs)

Select Case txtUsername.Text

Case "admin"

Case "host"

Case Else

   If txtUsername.Text.StartsWith("Domain") Then

      'The user added the wrong domain information

      If txtUsername.Text.Contains("/") Then

         txtUsername.Text = txtUsername.Text.Replace("/", "\")

      End If

Else

      'The user didn't enter the domain so add it for them

      txtUsername.Text = String.Format("Domain\{0}", txtUsername.Text)

   End If

End Select

End Sub

</script>

Then change

Have just begin my journey into DNN and this is exactly what I am looking for as we are wanting a mixed mode environment. I have got AD authentication working fine in 4.5.3 but would be very interested in looking at the code you use to add the check box for domain or local authentication

thanks