Null -.-

[lestatminiyo]

Me autosoluciono

Código:

Try
            If Membership.GetUser.ProviderUserKey Is Nothing Then
                msguser.Text = "No has iniciado sesión!"
            Else
                Dim UserID As String
                UserID = Membership.GetUser.UserName.ToString()
                msguser.Text = "Bienvenido " & UserID
            End If
        Catch ex As Exception
            msguser.Text = "No has iniciado sesión!"
        End Try