Timer tmr;
        public Form1()
        {
            InitializeComponent();

            this.Opacity = 0;
            tmr = new Timer();

            tmr.Interval = 20;

            tmr.Tick += new EventHandler(Opacity_Artir);
            tmr.Enabled = true;
        }

        private void Opacity_Artir(object sender, EventArgs e)
        {
            this.Opacity += 0.01;
            if (this.Opacity == 10)
            {

                this.Opacity = 100;
                tmr.Enabled = false;
            }
        }