C# Opening a new form and closing the other one

Question

In my program I show a login form before the main form, once the program detects a successful login I use this:

MainForm Main = new MainForm();
Main.Show();
         


        

Answer 1

You can use ApplicationContext.MainForm to specify current main form for the application:

static class Program
{
    public static ApplicationContext Context { get; set; }

    /// 

    /// The main entry point for the application.
    /// 
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);

        Context = new ApplicationContext(new LoginForm());
        // pass Context instead of just new LoginForm()
        Application.Run(Context);
    }
}

then in in login handler:

private void login_Click(object sender, EventArgs e)
{
    Program.Context.MainForm = new MainForm();

    // close login form
    this.Close();

    // set up context to track main form instead of login
    Program.Context.MainForm.Show(); 
}