Update function help

[raulh]

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        lbl1.Text = ("Parsing file...")
        Dim baseDir As New DirectoryInfo(Application.ExecutablePath)
        Dim update As ugen.Update = ugen.Update.Parse("linkhere")
        For Each file As ugen.UpdateFile In update.Files
            Dim fi As New FileInfo(baseDir.FullName + file.FilePath)
            If (fi.Exists) Then ' its supposed to be if it exists check if it doesnt exist just update it
                Dim size As Integer = fi.Length
                Dim hash As String = makeHash(fi)
                If size <> file.Size Or hash <> file.Hash Then
                    update(file)

                End If
            Else
                update(file)
            End If

        Next
    End Sub
End Class

Namespace ugen
    Public Class Update
        Public Files As New List(Of UpdateFile)()

        Public Sub New()
        End Sub
        Public Shared Function Parse(ByVal url As String) As Update
            Dim data As String = New WebClient().DownloadString(url)
            Dim update As New Update()
            Dim lines As String() = data.Split(New String() {vbCr & vbLf}, StringSplitOptions.RemoveEmptyEntries)
            For Each line As String In lines
                Try
                    Dim infos As String() = line.Split(New Char() {"|"c})
                    Dim name As String = infos(0)
                    Dim size As Integer = Integer.Parse(infos(1))
                    Dim hash As String = infos(2)
                    update.Files.Add(New UpdateFile(name, size, hash))
                Catch
                End Try
            Next
            Return update
        End Function
    End Class
    Public Class UpdateFile
        Private _filepath As String, _hash As String
        Private _size As Integer = -1
        Public Sub New(ByVal filepath As String, ByVal size As Integer, ByVal hash As String)
            _filepath = filepath
            _size = size
            _hash = hash
        End Sub
        Public Property FilePath() As String
            Get
                Return _filepath
            End Get
            Set(ByVal value As String)
                _filepath = value
            End Set
        End Property
        Public Property Hash() As String
            Get
                Return _hash
            End Get
            Set(ByVal value As String)
                _hash = value
            End Set
        End Property
        Public Property Size() As Integer
            Get
                Return _size
            End Get
            Set(ByVal value As Integer)
                _size = value
            End Set
        End Property
    End Class
End Namespace

i need a little help coding the update function and makehash function.