using (FileStream fs = new FileStream(Server.MapPath("~/uploadimg/" + fileName), chunk == 0 ? FileMode.OpenOrCreate : FileMode.Append))
            {
                //write our input stream to a buffer
                Byte[] buffer = null;
                if (Request.ContentType == "application/octet-stream" && Request.ContentLength > 0)
                {
                    buffer = new Byte[Request.InputStream.Length];
                    Request.InputStream.Read(buffer, 0, buffer.Length);
                }
                else if (Request.ContentType.Contains("multipart/form-data") && Request.Files.Count > 0 && Request.Files[0].ContentLength > 0)
                {
                    buffer = new Byte[Request.Files[0].InputStream.Length];
                    Request.Files[0].InputStream.Read(buffer, 0, buffer.Length);
                }
                //write the buffer to a file.
                fs.Write(buffer, 0, buffer.Length);
                fs.Close();
            }

我的意思是在   fs.Write(buffer, 0, buffer.Length);后面判断，文件是否已经写完了，这样，可以操作数据库了，判断文件存在不行，因为，这个文件如果分3次过来的，第一次后，已经在服务器端建立了这个文件。就是怎么检查这个文件已经完整了，因为这个程序需要flash不断的请求，只要没写完