使用正则表达式验证输入数字

        private void button1_Click(object sender, EventArgs e)
        {
            if (IsValidate(textBox1.Text.ToString()))
                label1.Text = "输入正确";
            else
                label1.Text = "请输入数字";
        }
        public bool IsValidate(string str_number) {
            return System.Text.RegularExpressions.
                Regex.IsMatch(str_number,@"^[0-9]*$");
        }