winform控件的二次开发

 public partial class SuperTextBox : TextBox
    {
        public SuperTextBox()
        {
            InitializeComponent();
        }

        public SuperTextBox(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
        }

        public int BeginCheckEmpty()
        {
            if (this.Text.Trim() == "")
            {
                this.errorProvider1.SetError(this, "必填项不能为空!");
                return 0;
            }
            else
            {
                this.errorProvider1.SetError(this, string.Empty);
                return 1;
            }
        }

        public int BeginCheckData(string regularExpress, string errorMsg)
        {
            if (BeginCheckEmpty() == 0) return 0;
            //正则表达式验证，忽略大小写
            Regex objRegex = new Regex(regularExpress, RegexOptions.IgnoreCase);
            if (!objRegex.IsMatch(this.Text.Trim()))
            {
                this.errorProvider1.SetError(this, errorMsg);
                return 0;
            }
            else
            {
                this.errorProvider1.SetError(this, string.Empty);//清楚小圆点的错误提示
                return 1;
            }
        }
    }

 private void btnAdd_Click(object sender, EventArgs e)
        {
            int a = this.txtName.BeginCheckEmpty();
            int b = this.txtAge.BeginCheckEmpty();

            int c = this.txtAge.BeginCheckData(@"^[1-9]\d*$", "年龄必须是正整数");

            int result = a * b *c;
            if (result != 0)
            {
                MessageBox.Show("提交成功！", "提示信息");
            }
        }