socket发送文件，等候时间设置

socket发送文件，等待时间设置
 if ((socket.Poll(outtime * 10000000, SelectMode.SelectWrite) == true))
                    {
                        senlen = socket.Send(buffer, senlen, left, SocketFlags.None);
                        left -= senlen;
                        if (left == 0)
                        {
                            flag = 0;  //数据发送完毕
                            break;
                        }
                        else
                        {
                            if (senlen > 0)
                            {
                                continue; //数据发送部分
                            }
                            else
                            {
                                flag = -2;  //发送数据发生错误
                                break;
                            }
                        }
                    }
                    else
                    {
                        flag = -1; //超时退出
                        break;
                    }
                }
            }
            catch (SocketException)
            {
                flag = -3;
            }
            return flag;

        }
中等待时间，我必须设置成 10000000，不然发完一个buffer后，直接flag就等于-1了，请问是为什么啊？但时间没等那么久啊
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这都哪抄来的代码。。现在网络上的Socket 代码10有8.9都是不能用的。
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根本看不懂你这是啥逻辑
另外outtime的值是啥