Roman To Decimal Converter in Visual Basic NET

I wrote this program to ask the user to give a value in roman numerals and then the program will convert from roman numerals into decimal equivalent using Microsoft Visual Basic NET as my programming language.

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Sample Program Output

Program Listing

Public Class Form1

    Private Enum RomanDigit

        I = 1

        V = 5

        X = 10

        L = 50

        C = 100

        D = 500

        M = 1000

    End Enum

    Public Shared Function RomanToNumbers(ByVal roman As String) As Integer

        roman = roman.ToUpper().Trim()

        If roman = "N" Then

            Return 0

        End If

        Dim ptr As Integer = 0

        Dim values As New ArrayList()

        Dim maxDigit As Integer = 1000

        While ptr < roman.Length

            Dim numeral As Char = roman(ptr)

            Dim digit As Integer = CInt([Enum].Parse(GetType(RomanDigit), numeral.ToString()))

            Dim nextDigit As Integer = 0

            If ptr < roman.Length - 1 Then

                Dim nextNumeral As Char = roman(ptr + 1)

                nextDigit = CInt([Enum].Parse(GetType(RomanDigit), nextNumeral.ToString()))

                If nextDigit > digit Then

                    maxDigit = digit - 1

                    digit = nextDigit - digit

                    ptr += 1

                End If

            End If

            values.Add(digit)

            ptr += 1

        End While

        Dim total As Integer = 0

        For Each digit As Integer In values

            total += digit

        Next

        Return total

    End Function

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        If MsgBox("Are you sure you want to quit?", MsgBoxStyle.YesNo Or MsgBoxStyle.DefaultButton2, "Close application") = Windows.Forms.DialogResult.Yes Then

            Me.Close()

        End If

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim display As Double

        display = RomanToNumbers(TextBox1.Text)

        MsgBox("The Decimal Equivalent is " & display & ".", vbInformation, "The Result")

        TextBox1.Text = ""

        TextBox1.Focus()

    End Sub

End Class