VB.NET อยากสอบถามเรื่อง Dropdownlist Calculate / Calculator รบกวนด้วยครับ

Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Globalization
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Imports PopCalc.Library
Namespace PopCalc.Test
	Public Partial Class Form1
		Inherits Form
		Public Sub New()
			InitializeComponent()
		End Sub
		Private Sub m_BoxParse_CalculatorParse(sender As Object, e As CalculatorParseEventArgs)
			Dim c As CultureInfo = CultureInfo.CurrentCulture
			Dim cs As String = c.NumberFormat.CurrencySymbol
			Dim ns As String = c.NumberFormat.NegativeSign
			Dim parsed As String = e.Original
			If parsed.Contains(cs) Then
				parsed = parsed.Replace(cs, "")
			End If
			If parsed.StartsWith("(") AndAlso parsed.EndsWith(")") Then
				parsed = ns & parsed.Replace("(", "").Replace(")", "")
			End If
			e.Parsed = parsed
		End Sub
		Private Sub m_BoxParse_CalculatorFormat(sender As Object, e As CalculatorFormatEventArgs)
			e.FormattedResult = e.Result.ToString("c")
		End Sub
	End Class
End Namespace