ASP.NET 页面数据校验类 李天平老师写的，很好的

    using System.Text.RegularExpressions;
 
/// <summary>
    /// 页面数据校验类
    /// 李天平
    /// 2004.8
    /// </summary>
    public class PageValidate
    {
        private static Regex RegNumber = new Regex("^[0-9]+$");
        private static Regex RegNumberSign = new Regex("^[+-]?[0-9]+$");
        private static Regex RegDecimal = new Regex("^[0-9]+[.]?[0-9]+$");
        private static Regex RegDecimalSign = new Regex("^[+-]?[0-9]+[.]?[0-9]+$"); //等价于^[+-]?\d+[.]?\d+$
        private static Regex RegEmail = new Regex("^[\\w-]+@[\\w-]+\\.(com|net|org|edu|mil|tv|biz|info)$");//w 英文字母或数字的字符串，和[a-zA-Z0-9] 语法一样
        private static Regex RegCHZN = new Regex("[\u4e00-\u9fa5]");
        public PageValidate()
        {
        }
        #region 数字字符串检查
        /// <summary>
        /// 检查Request查询字符串的键值，是否是数字，最大长度限制
        /// </summary>
        /// <param name='req'>Request</param>
        /// <param name='inputKey'>Request的键值</param>
        /// <param name='maxLen'>最大长度</param>
        /// <returns>返回Request查询字符串</returns>
        public static string FetchInp