我的专栏

private string CreatePWD(PWDMark mark,int pwdlength, bool isUpper, bool isLower, bool isNumber, bool isSpecial) {           string createdPWD = string.Empty;             if (pwdlength         

I do not know why the balloon cant be poped out.I use NotifyIcon1.ShowBalloonTip(.....).If the Icon property was set, It can works.I solve this problem.