Using Random function with "do...until" in VB.NET

Question

I have to write a small program which will roll 2 dice until both display a 1.  Both numbers rolled each time must also be displayed in a list box.
I have this so far:


        lboDiceRolls.Items.Clear()

        Dim iDice1 As Integer
        Dim iDice2 As Integer

        Randomize()

        Do Until iDice1 = 1 And iDice2 = 1
            iDice1 = (Rnd() * 5) + 1
            iDice2 = (Rnd() * 5) + 1
            lboDiceRolls.Items.Add(iDice1 & iDice2)
        Loop
 End Sub

It isn't displaying anything, and I have tried many different versions of the above statement using different combinations of things.  I know I'm probably missing something really dumb, but I'm very new to using VB so I'm not sure if I'm on the right track.