C#一個漸層並且消失的表單

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.timer1.Enabled = true;//擷取當前已耗用時間
            this.Opacity = 1;//擷取當前表單的透明度層級;

        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (this.Opacity >0.9)
            {
                this.Opacity = this.Opacity -0.01;//表單以0.01的速度漸層
            }
            else if (this.Opacity < 0)
            {
                this.timer1.Enabled = false;//時間為false

            }
            else
            {
                Close();///漸層消失
            }
        
        }
    }
}