Download multiple files as Zip in ASP.Net

I have some documents in a folder ..i am creating zip file using the following code..but i am not able to download it at client side.

Thanks in Advance

Vidya

Imports ICSharpCode.SharpZipLib.Zip
Imports ICSharpCode.SharpZipLib.Core

Public Function ByteArrayToFile(_FileName As String, _ByteArray As Byte()) As Boolean
        Try

            If File.Exists(Server.MapPath("~/Conference/files/") & _FileName) Then File.Delete(Server.MapPath("~/Conference/files/") & _FileName)
            Dim _FileStream As New System.IO.FileStream(Server.MapPath("~/Conference/files/") & _FileName, System.IO.FileMode.Create, System.IO.FileAccess.Write)
            _FileStream.Write(_ByteArray, 0, _ByteArray.Length)
            _FileStream.Close()
            _FileStream.Dispose()

          
            Using ZipOut As New ZipOutputStream(File.Create(Server.MapPath("~/Conference/files/" & _FileName & ".zip")))
                ZipOut.SetLevel(9)
                Dim entry As New ZipEntry(Server.MapPath("~/Conference/files/") & _FileName)
                entry.DateTime = DateTime.Now
                Dim ms As New MemoryStream(_ByteArray)
                Response.ClearContent()
                Response.Clear()
                Response.AddHeader("Content-Disposition", "inline; filename=" & _FileName & ".zip")
                Response.ContentType = "application/zip"
                '   Response.BinaryWrite(_ByteArray)
                Response.Write(ms.ToArray())
                Response.End()


                ZipOut.Finish()
                ZipOut.Close()
            End Using

        Catch ex As Exception
            Lbl_Error.Text = "Error :" & ex.Message

        End Try



        Return False
    End Function