Decimal to roman numeral converter in vb.net

Vb program for Decimal to roman numeral converter. Here more solutions.

' Include namespace system
Imports System 
'  Vb.net program for
'  Conversion from Decimal to roman number
public Class Perform
    ' Display roman value of n
    Public Shared Sub result(ByVal n As Integer)
        Select Case (n)
            ' Test Cases
            Case 1
                Console.Write("I")
            Case 4
                Console.Write("IV")
            Case 5
                Console.Write("V")
            Case 9
                Console.Write("IX")
            Case 10
                Console.Write("X")
            Case 40
                Console.Write("XL")
            Case 50
                Console.Write("L")
            Case 90
                Console.Write("XC")
            Case 100
                Console.Write("C")
            Case 400
                Console.Write("CD")
            Case 500
                Console.Write("D")
            Case 900
                Console.Write("DM")
            Case 1000
                Console.Write("M")
        End Select
    End Sub
    Public Shared Function  selecting(ByVal number As Long, 
                                      ByVal collection As Integer(), 
      								  ByVal size As Integer) As Long
        Dim n As Integer = 1
        Dim i As Integer = 0
        With Nothing
            i = 0
            While i < size
                if (number >= collection(i)) Then
                    n = collection(i)
                Else
                    Exit While
                End IF
                Threading.Interlocked.Increment(i)
            End While
        End With
        result(n)
        ' Reduce the value of number
        Return  number - n
    End Function
    Public Shared Sub romanNo(ByVal number As Long)
        if (number <= 0) Then
            ' When is not a natural number
            Return
        End If
        ' Base case collection
        Dim collection As Integer() =
        {1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900, 1000}
        ' Get the size of collection
        Dim size As Integer = collection.Length
        Console.Write(" {0} : ",number)
        while (number > 0)
            number = selecting(number, collection, size)
        End While
        ' Add new line
        Console.WriteLine()
    End Sub
    Public Shared Sub Main(ByVal args As String())
        ' Test Case
        romanNo(10)
        romanNo(18)
        romanNo(189)
        romanNo(604)
        romanNo(982)
        romanNo(3000)
    End Sub
End Class

Output

 10 : X
 18 : XVIII
 189 : CLXXXIX
 604 : DCIV
 982 : DMLXXXII
 3000 : MMM