There are many ways, for example a simple solution is to check:
lbl1.Text = IIf(hiddenarray.Lenght > 0, hiddenarray(0), "")
lbl2.Text = IIf(hiddenarray.Lenght > 1, hiddenarray(1), "")
'etc
Another way is to loop selecting the textbox dinamically by its name:
For i As Integer = 0 To hiddenarray.Lenght - 1
Me.Controls("lbl" & i + 1).Text = hiddenarray(i)
Next