/// 
        /// 正规则试验IP地址        /// 
        ///         /// 
             public bool IPCheck(string IP)        {            string num = "(25[0-5]|2[0-4]\\d|[0-1]\\d{2}|[1-9]?\\d)";            return Regex.IsMatch(IP, ("^" + num + "\\." + num + "\\." + num + "\\." + num + "[        DISCUZ_CODE_0        ]quot;));        }        private void Form1_FormClosed(object sender, FormClosedEventArgs e)        {            System.Environment.Exit(0);        }        #region ip转换        /// 
        /// ip转成long        /// 
        ///         /// 
             public static long IpToInt(string ip)        {            char[] separator = new char[] { '.' };            string[] items = ip.Split(separator);            return long.Parse(items[0]) << 24                    | long.Parse(items[1]) << 16                    | long.Parse(items[2]) << 8                    | long.Parse(items[3]);        }        /// 
        /// long转成ip        /// 
        ///         /// 
             public static string IntToIp(long ipInt)        {            StringBuilder sb = new StringBuilder();            sb.Append((ipInt >> 24) & 0xFF).Append(".");            sb.Append((ipInt >> 16) & 0xFF).Append(".");            sb.Append((ipInt >> 8) & 0xFF).Append(".");            sb.Append(ipInt & 0xFF);            return sb.ToString();        }        #endregion