c#输入框只能输入数字方法

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/// <summary>
        /// 判断是否输入的是数字allyn
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void txtAllPrice_KeyPress(object sender, KeyPressEventArgs e)
        {
            char bb = e.KeyChar;
            getMethod(bb,e);

        }
        public void getMethod(char KeyChar, KeyPressEventArgs e)
        {

            if ((Convert.ToInt32(KeyChar) == 8))
            {
                e.Handled = false;
            }
            else
            {
                Regex numRegex = new Regex(@"^(-?[0-9]*[.]*[0-9]*)$");
                Match Result = numRegex.Match(Convert.ToString(KeyChar));
                if (Result.Success)
                {
                    e.Handled = false;
                }
                else
                {
                    e.Handled = true;
                }
            }

        }