判断是否为数字方法

 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