验证是否是正整数，是否是mail，是否是正确的身份证

    /// <summary>
    /// 通用验证类
    /// </summary>
    class DataValidate
    {
        /// <summary>
        /// 验证正整数
        /// </summary>
        /// <param name="txt"></param>
        /// <returns></returns>
        public static bool IsInteger(string txt)
        {
            Regex objReg = new Regex(@"^[1-9]d*$");
            return objReg.IsMatch(txt);
        }
        /// <summary>
        /// 验证是否是Email
        /// </summary>
        /// <param name="txt"></param>
        /// <returns></returns>
        public static bool IsEmail(string txt)
        {
            Regex objReg = new Regex(@"w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*");
            return objReg.IsMatch(txt);
        }
        /// <summary>
        /// 验证身份证
        /// </summary>
        /// <param name="txt"></param>
        /// <returns></returns>
        public static bool IsIdentityCard(string txt)
        {
            Regex objReg = new Regex(@"^(d{15}$|^d{18}$|^d{17}(d|X|x))$");
            return objReg.IsMatch(txt);
        }