private void btvoltar_Click(object sender, EventArgs e)
        {
            FRMPrincipal p = new FRMPrincipal(list);

            p.Show();
            this.Visible = false;
        }
 private void timer1_Tick(object sender, EventArgs e)
 {
     if (progressBar1.Value < 100)
     {
         progressBar1.Value = progressBar1.Value + 2;
     }
     else
     {
         timer1.Enabled = false;
         FRMPrincipal p = new FRMPrincipal(list);
         p.Show();
         this.Visible = false;
     }
 }