我弄到一个欢迎界面是这样弄的：
基本上我也看懂了是什么回事
现在就是想要在界面结束时弹出一个登陆界面，要在哪里加呢？
大概加些什么代码？

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

        private bool isFade = true;

        private void Form1_Load(object sender, EventArgs e)
        {
            this.ClientSize = this.BackgroundImage.Size;
            this.Opacity = 0;
            this.timer1.Interval = 50;
            this.timer1.Enabled = true;
            this.timer1.Start();



        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (isFade)
            {
                this.Opacity += 0.02;

                if (this.Opacity >= 1)
                {
                    isFade = false;
                }
            }
                else
                {
                    this.Opacity -= 0.02;
                    if (this.Opacity <= 0)
                    {
                        this.timer1.Stop();
                        this.Close();
        
                        
                        
                    }
                }
            }

好，我去试一下

可以不可以用showdialog()?
会不会简单点?