详解C#切换窗口

public MainFrom_Client()
{
InitializeComponent();
SetMainTreadState();
}
//先设定主窗体（也就是MainFrom_Client）的透明度和任务栏状态
private void SetMainTreadState()
{
//这个其实是障眼法！把主窗体（也就是MainFrom_Client）的弄成隐形的，
//只需要把Opacity改成就出来了，哈哈哈哈哈哈哈哈
this.Opacity = ;
//然后在把菜单栏运行的显示也隐形掉
this.ShowInTaskbar = false;
}
private void ResetMainThreadState()
{
this.Opacity = ;
this.ShowInTaskbar = true;
//把当前控件带到前面来就好了
this.BringToFront();
}

static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Login_interface login_ = new Login_interface();
login_.Show();
Application.Run();
} 

#region 由登陆界面进入到用户界面
private void button_Click(object sender, EventArgs e)
{
if (textBox_UserName.Text == "" && textBox_PassWord.Text == "")
{
this.Close();
User_Panel fm = new User_Panel();
fm.Show();
}
else
{
MessageBox.Show("用户名与密码错误，请重新输入");
}
}
#endregion