private void TimerDesaparecer_Tick(object sender, EventArgs e)
 {
     this.Opacity -= 0.1;
     if (this.Opacity == 0)
     {
         TimerDesaparecer.Stop();
         this.Close();
     }
 }
        private void TimerAparecer_Tick(object sender, EventArgs e)
        {
            if (this.Opacity < 1)
            {
                this.Opacity += 0.05;
            }

            CircubarBienve.Value += 1;
            CircubarBienve.Text   = CircubarBienve.Value.ToString();
            if (CircubarBienve.Value == 100)
            {
                TimerAparecer.Stop();
                TimerDesaparecer.Start();
            }
        }