Download a mdb file and modify it in client side

Private Sub btnDavid_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDavid.Click


        Dim sPathInforme As String = String.Empty

        sPathInforme = CType(Server.MapPath("plantillas/"), String)

        Dim oFileStream As System.IO.FileStream

        oFileStream = System.IO.File.OpenWrite(sPathInforme + "actas" + ".mdb")

        Dim mystream As New MemoryStream

        mystream = StreamToMemory(oFileStream)

        oFileStream.Flush()
        oFileStream.Close()

        Response.Clear()

        Response.AppendHeader("Content-Disposition", "attachment; filename=actas.mdb")

        Response.AppendHeader("Content-Length", mystream.Length.ToString())

        'Response.ContentType = "application/octet-stream"
        Response.ContentType = "application/x-msaccess"

        Response.BinaryWrite(mystream.ToArray())

        Response.End()
        mystream.Close()

    End Sub

    ' open a file stream for reading, and load into a memory stream
    Public Function StreamToMemory(ByVal path As String) As MemoryStream

        Dim input As FileStream
        Dim output As MemoryStream

        input = New FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read)
        output = StreamToMemory(input)
        input.Close()

        Return output

    End Function

    ' transfer contents of input stream to memory stream
    Public Function StreamToMemory(ByVal input As Stream) As IO.MemoryStream

        Dim buffer(1023) As Byte
        Dim count As Integer = 1024
        Dim output As MemoryStream

        ' build a new stream
        If input.CanSeek Then
            output = New MemoryStream(input.Length)
        Else
            output = New MemoryStream
        End If

        ' iterate stream and transfer to memory stream
        Do
            count = input.Read(buffer, 0, count)
            If count = 0 Then Exit Do
            output.Write(buffer, 0, count)
        Loop

        ' rewind stream
        output.Position = 0

        ' pass back
        Return output

    End Function