ASP.NET download/open file/stream in browser

//for very big files use  HttpReponse.TransmitFile()  http://msdn.microsoft.com/en-us/library/12s31dhy(v=vs.80).aspx

protected void SendFileToResponse(string physicalPath, string fileName)
{
    //se si presenta il problema della cache del browser si può appendere una querystring casuale in modo da far ricaricare
    CurrentContext.Response.ContentType = FileContentType; //"application/pdf", "image/png"
    string tmp = "inline";
    if (CurrentContext.Request.QueryString["d"] == "1")
    {
        tmp = "attachment";
    }
    CurrentContext.Response.AddHeader("Content-Disposition", string.Format("{1}; filename={0}", fileName, tmp));

    using (Stream s = new FileStream(physicalPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
    {
        s.CopyTo(CurrentContext.Response.OutputStream);
    }
    if (CurrentContext.Response.IsClientConnected)
    {
        CurrentContext.Response.Flush();
    }
}

private void SendStreamToResponse(MemoryStream stream, string fileName)
{
    //se si presenta il problema della cache del browser si può appendere una querystring casuale in modo da far ricaricare
    CurrentContext.Response.ContentType = FileContentType;  //"application/pdf", "image/png"
    string tmp = "inline";
    if (CurrentContext.Request.QueryString["d"] == "1")
    {
        tmp = "attachment";
    }
    CurrentContext.Response.AddHeader("Content-Disposition", string.Format("{1}; filename={0}", fileName, tmp));

        //stream is disposed by method caller
    stream.WriteTo(CurrentContext.Response.OutputStream);
    if (CurrentContext.Response.IsClientConnected)
    {
        CurrentContext.Response.Flush();
    }
}