private void tbPrice_KeyDown(object sender, KeyEventArgs e)
{
e.SuppressKeyPress = true;
if (InputKey.ValidNumberKey(e))
{
e.SuppressKeyPress = false;
}
else if (InputKey.IsDecimalPoint(e))
{
if (!TextBoxInput.ContainsDecimalPoint(tbPrice) ||
TextBoxInput.AllTextSelected(tbPrice) ||
TextBoxInput.SelectionContainsDecimalPoint(tbPrice))
{
e.SuppressKeyPress = false;
}
}
}