UploadContext context = UploadContextFactory.GetUploadContext();
        string FileName = context.GetFileNameByControl(myfile.UniqueID);
        string filePath = Request.MapPath("~/myupload/");
        if ((context != null) && (context.Status == uploadStatus.Complete))
        {
            if (context.SaveFile(myfile.UniqueID, filePath + FileName))
            {
                UploadContextFactory.Release();//释放资源,删除临时文件
            }
        }

1.为什么上传成功了还是无法删除临时文件?我都加了语句啊!
 protected void btn_cancel_Click(object sender, EventArgs e)
    {
        UploadContext upload = UploadContextFactory.GetUploadContext(Request["UploadID"]);
        upload.Abort = true;
    }
2.点击取消了 为什么还上传没有终止还是一直继续?要f5刷新一下才终止!我都按官方来做了啊 help!
大文件上传组件使用说明 http://www.cnblogs.com/bashan/archive/2008/05/23/1206095.html