C＃.net Winform -Multiple forms show＆hide

Question

我用c＃.net在visual studio 2008中取3种形式。在Form1中有2个按钮，如果我点击第一个按钮然后Form2将显示&同时我点击第二个按钮，然后Form3将显示&已经打开Form2将隐藏。

Answer 1

//loop through all open forms 
foreach (Form f in Application.OpenForms) 
{ 
    if (f.Name != "Form1") //if it's not Form1 
     f.Hide(); //then hide it (or close) 
} 
//show the form you want (ex: Form3) 
new Form3().Show();