判断自否为数字，这里我们一般用于Request跳转传自增ID的时候验证是否为数字

#region 判断是否为数字

        /// <summary>

        /// 判断是否为数字

        /// </summary> 

        /// </summary> 

        /// <returns>true/false</returns>

        public static bool isNumber(string s)

        {

            int Flag = 0;

            char[] str = s.ToCharArray();

            for (int i = 0; i < str.Length; i++)

            {

                if (Char.IsNumber(str[i]))

                {

                    Flag++;

                }

                else

                {

                    Flag = -1;

                    break;

                }

            }

            if (Flag > 0)

            {

                return true;

            }

            else

            {

                return false;

            }

        }

        #endregion