c#点击按钮跳转到另一窗口后将本窗口关闭

Form1是主窗口.Form2是子窗口.
实现点击按钮后弹出Form2.然后主窗口关闭.退出Form2时主窗口再弹出来供其他操作.

1.主窗口不能关闭，只能影藏，给form1设置焦点，当窗体激活时发生

Form2 myform = new Form2();
myform.Show();
this.Opacity = 0;

private void Form1_Activated(object sender, EventArgs e)
{
this.Opacity = 100;
}

2.传递值：

namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{
this.Opacity = 0;
Form2 f2 = new Form2();
f2.ShowDialog();
this.Opacity = f2.ss;
}
}
}

namespace WindowsApplication1
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
this.Close();
}
public int ss
{
get
{
return 100;
}
}
}
}

3.C#关闭窗口时把之前隐藏的主窗口一起关闭：

Application.Exit();

4.在按钮后弹出Form2.然后主窗口进行隐藏.退出Form2时主窗口再显示出来

Form2 fm2 = new Form2();
fm2.Show();
// 不在任务栏显示
this.ShowInTaskbar = false;
// 窗体透明
this.Opacity = 0; //后面的取值0~100 ,0表示透明