Question

In my project, there are two forms frmLogin and frmMain. After successful login from frmLogin I am showing the frmMain form to the user by doing something like this:

In frmLogin form button_click event:

frmMain main = new frmMain();
main.Show();
this.Hide();

In frmMain when the user logs out I want to show the same frmLogin form (not the instance). How to do this?

I tried this code: (creating another instance of frmLogin which I don’t want)

In frmMain form button_click event:

if (MessageBox.Show("Do you really want to log out?", "Alert", MessageBoxButtons.YesNo).Equals(DialogResult.Yes))
{
    this.FormClosing -= frmMain_FormClosing;
    //
    Process p = new Process();
    p.StartInfo.FileName = Application.ExecutablePath;
    p.Start();
    //
    this.Dispose();
}

I have also tried using internal specifier but no use.

EDIT: As a trainee, I am not allowed to use Static keyword and altering program.cs. If the above approach requires restricted methods (which I have mentioned) then please suggest me an alternate approach.

Answer 1

All what you have to do is assign login page as owner of nextform to be opened

In your login Page call following function where you want to open nextForm

void openNextForm()
{
    Form f2 = new YourForm();    
    f2.owner=this;
    f2.Show();
    this.Hide();
}

In your nextForm (e.g mainForm) write following aginst your button click

void ButtonLogOut_Click(object sender, EventArgs e)
{
     this.Owner.Show();
     this.Hide();
     this.Dispose();
}