String Split Headache

[Rajada]

I did a little more coding and came up with how I wanted to use this, but it throws a bunch of exceptions at me, even though the code works fine.

 totalPriceString = totalPrice.ToString
            Dim priceArray() = totalPriceString.Split("."c)

            If ((priceArray IsNot Nothing) And (UBound(priceArray) = 0)) Then ' I have no decimals
                totalPriceString = totalPrice.ToString & ".00"
                salesTaxString = salesTax.ToString & ".00"
            ElseIf ((priceArray IsNot Nothing) And (UBound(priceArray) = 1)) Then ' I have one or two decimals already
                If (priceArray(1).Length = 1) Then
                    totalPriceString = totalPrice.ToString & "0"
                    salesTaxString = salesTax.ToString & "0"
                End If
            End If

The exceptions:

A first chance exception of type 'System.IndexOutOfRangeException' occurred
A first chance exception of type 'System.NullReferenceException' occurred
A first chance exception of type 'System.NullReferenceException' occurred
A first chance exception of type 'System.NullReferenceException' occurred
A first chance exception of type 'System.NullReferenceException' occurred
A first chance exception of type 'System.NullReferenceException' occurred
A first chance exception of type 'System.IndexOutOfRangeException' occurred
A first chance exception of type 'System.IndexOutOfRangeException' occurred
A first chance exception of type 'System.IndexOutOfRangeException' occurred
A first chance exception of type 'System.IndexOutOfRangeException' occurred

I understand what the exceptions mean, just not why I am getting them in this case when I specifically checked to prevent them...