private void timer1_Tick(object sender, EventArgs e)
 {
     //this.Opacity -= 0.01;
     progressBarX1.Minimum = 0;
     progressBarX1.Maximum = 200;
     progressBarX1.Value++;
     //if (this.Opacity == 0) this.Dispose();
     if (progressBarX1.Value == progressBarX1.Maximum)
     {
         //this.Dispose();
         timer1.Enabled = false;
         frmDangNhap dangnhap = new frmDangNhap();
         dangnhap.ShowDialog();
         //MessageBox.Show(thongtindn .username);
         frmMainChinh fmain = new frmMainChinh();
         this.Hide();
         fmain.ShowDialog();
     }
 }