C＃.net Winform -Multiple forms show＆hide

Question

我用c＃.net在visual studio 2008中取3種形式。在Form1中有2個按鈕，如果我點擊第一個按鈕然後Form2將顯示&同時我點擊第二個按鈕，然後Form3將顯示&已經打開Form2將隱藏。

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();