Download file works for all browsers except Safari

I have a web page that displays a ListView control populated with rows that contain a path to files that can be downloaded.  When a link on the listview is clicked, that file will be downloaded to the user's PC.  This works for all browsers we tested except Safari on a mac.  Here is the code of the SelectedIndexChanged event:
protected void lvDownloads_SelectedIndexChanging(object sender, ListViewSelectEventArgs e) { string sId; sId = lvDownloads.DataKeys[e.NewSelectedIndex].Value.ToString(); System.Web.HttpContext context = System.Web.HttpContext.Current; string ipAddress = Convert.ToString(context.Request.ServerVariables["REMOTE_ADDR"]); Int32 iDownloadId = 0; iDownloadId = Convert.ToInt32(sId); string filePath = Convert.ToString(SqlHelper.ExecuteScalar(connStringHG, "GetDownloadsById", iD ...