Multiple Fileupload for ASP.NET with Client Side Resizing of Images

Public Class upload
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If IsNothing(Request.Form("chunk")) = False Then
            If Session("ID") Is Nothing Then
                Session("ID") = Guid.NewGuid.ToString
                IO.Directory.CreateDirectory(Server.MapPath("Uploads/" & Session("ID")))
            End If
            Dim chunk As Integer = Request.Form("chunk")
            Dim chunks As Integer = Request.Form("chunks")
            Dim filename As String = Request.Form("name")
            If chunk = 0 Then
                Request.Files(0).SaveAs(Server.MapPath("Uploads/") & Session("ID") & "/" & Request.Files(0).FileName)
            Else
                Dim OutputStream As New IO.FileStream(Server.MapPath("Uploads/") & Session("ID") & "/" & Request.Files(0).FileName, IO.FileMode.Append)
                Dim InputBytes(Request.Files(0).ContentLength) As Byte
                Request.Files(0).InputStream.Read(InputBytes, 0, Request.Files(0).ContentLength)
                OutputStream.Write(InputBytes, 0, InputBytes.Length - 1)
                OutputStream.Close()
            End If
        End If
    End Sub

End Class