ASP.NET 判断手机号码

string mobile = shoujihaoma.Text; //号码
        Match m = Regex.Match(mobile, "(13|15)\\d{9}");
        while (m.Success)
        {
            TxtBox1.Text = "正确";
            m = m.NextMatch();
        }
       
            /// <summary>
    /// 是否是手机号码
    /// </summary>
    /// <param name="val"></param>
    public static bool IsMobile(string val)
    {
        return Regex.IsMatch(val, @"^1[358]\d{9}$", RegexOptions.IgnoreCase);
    }