How do I prevent the app from terminating when I close the startup form?

Question

There is two Forms in my project : Form1 and Form2. There is a button in Form1, and what I want to do is closing Form1 and showing Form2 when that button clicked.

Fi

Answer 1

By default, the first form controls the lifetime of a Windows Forms application. If you want several independent windows forms your application context should be a separate context from the forms.

public class MyContext : ApplicationContext
{
   private List
 forms;     

   private static MyContext context = new MyContext();

   private MyContext()
   {
      forms = new List();
      ShowForm1();
   }

   public static void ShowForm1()
   {
      Form form1 = new Form1();
      context.AddForm(form1);
      form1.Show();
   }

   private void AddForm(Form f)
   { 
      f.Closed += FormClosed;
      forms.Add(f);
   }

   private void FormClosed(object sender, EventArgs e)
   {
      Form f = sender as Form;
      if (form != null)
          forms.Remove(f);
      if (forms.Count == 0)
         Application.Exit();
   }          
}

To use the context, pass it to Application.Run (instead of the form). If you want to create another Form1, call MyContext.ShowForm1() etc.

public class Program
{
   public void Main()
   {
      Application.Run(new MyContext());
   }
}