code kiễm tra số đã test cho ae

code kiễm tra số đã test cho ae
(tùng)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;

public partial class Default3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

private static bool IsNumber(string val)
{
if (val != "")
return Regex.IsMatch(val, @"^[0-9]\d*\.?[0]*$");
else return true;
}

protected void Button1_Click(object sender, EventArgs e)
{
if (IsNumber(TextBox1.Text) != true)
{
Label1.Text=" Nhap sai";
}
else
Label1.Text=" Nhap dung";
}

}