Visual Basic Null Reference

[TombatWombat]

I'm pretty new to VB and I encountered the following error "NullReferenceException was unhandled" with this code:

    Public Class User
        Public Forename As String
        Public Surname As String
        Public Username As String
        Public Password As String
    End Class

And then later this to assign a value

Users(UserIndex).Forename = Console.ReadLine()

Then I hit the error.
This is in a console application on VB 2010, can anyone give me a hand here?

[Emma.J]

Well the first thing here is that if you are not entering the data and running the method readline() then definitely it will give you the null reference exception error because the value is not entered and it is being forced to be read. Now what you have to do here is that use the writeline() method and try and enter the data and then see whether doing the same helps or not.