EditEventWindow.on_entry_tv_value_changed C# (CSharp) Method

    private void on_entry_tv_value_changed(object o, EventArgs args)
    {
        if(Util.IsNumber(entry_tv_value.Text.ToString(), true)){
            entryTv = entry_tv_value.Text.ToString();
            button_accept.Sensitive = true;
        } else {
            button_accept.Sensitive = false;
        }
    }