C#.Net Numeric TextBox by thousand separator like: 123,456,789

NumericTextBox.cs

    public class NumericTextBox : TextBox
    {
        private const char Delete = (char)8;
        private const char Backspace = '\b';

        public bool IsNumeric { get; set; } = false;

        public new string Text
        {
            get { return IsNumeric ? base.Text?.Replace(",", "") : base.Text; }

            set
            {
                var val = IsNumeric ? value?.Replace(",", "") : value;
                base.Text = IsNumeric ? double.Parse(string.IsNullOrEmpty(val) ? "0" : val).ToString("N0") : val;
                if(IsNumeric) Select(base.Text.Length, 0);
            }
        }

        /// <summary>
        /// Check typing char for numeric or not
        /// </summary>
        /// <param name="e"></param>
        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            if (IsNumeric && e.KeyChar != Delete && e.KeyChar != Backspace && !char.IsDigit(e.KeyChar) /*&& e.KeyChar != '.'*/)
            {
                e.Handled = true; // Reject the input
            }
        }

        /// <summary>
        /// Set new value to Text property
        /// </summary>
        /// <param name="e"></param>
        protected override void OnTextChanged(EventArgs e)
        {
            Text = base.Text;

            base.OnTextChanged(e);
        }
    }