c# winform文本框数字，数值校验

        public void DigitCheck_KeyPress(object sender, KeyPressEventArgs e)
        {
            e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar);
        }

        public void DecimalCheck_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!char.IsControl(e.KeyChar)
                && !char.IsDigit(e.KeyChar)
                && e.KeyChar != '.')
            {
                e.Handled = true;
            }

            // only allow one decimal point
            if (e.KeyChar == '.'
                && (sender as TextBox).Text.IndexOf('.') > -1)
            {
                e.Handled = true;
            }
        }