public static void limitedNumberInputOnly(object sender, int max)
{
if (!handled)
{
TextBox obj = (TextBox)sender;
if (Utils.hasExceeded(obj.Text, max) || !Utils.isValidNumber(Utils.getLastCharacter(obj.Text)))
{
handled = true;
if (!Utils.isEmpty(obj.Text))
{
obj.Text = obj.Text.Substring(0, obj.Text.Length - 1);
}
}
}
else
{
handled = false;
}
}