How do I close the form I’m in?

Question

private void BtnEntrar_Click(object sender, EventArgs e)
    {
        string login = txtLogin.Text;
        Conta conta = new Conta();
        try
        {
            BLL bll = new BLL();
            conta = bll.SelectContaByLogin(login);
            if(txtSenha.Text == conta.Senha)
            {
                TelaDeLogin form1 = new TelaDeLogin();
                form1.Close();
                TelaInicial form2 = new TelaInicial();
                form2.ShowDialog();

            } else
            {
                MessageBox.Show("Login ou senha incorretos.");
            }
        }
        catch(Exception ex)
        {
            throw ex;
        }
    }

I’m doing a Login and Password system in Visual Studio with C#, and I need to close the form Login when the user logs in.

The part about opening the form Home Screen works, but the form1.Close() does not work. I tried Hide(), tried this.Close(), but it’s not closing either.

Answer 1

It does not close due to ShowDialog()

private void BtnEntrar_Click(object sender, EventArgs e)
{
    string login = txtLogin.Text;
    Conta conta = new Conta();
    try
    {
        BLL bll = new BLL();
        conta = bll.SelectContaByLogin(login);
        if(txtSenha.Text == conta.Senha)
        {
            this.Hide();
            TelaInicial form2 = new TelaInicial();
            form2.Show();

        } else
        {
            MessageBox.Show("Login ou senha incorretos.");
        }
    }
    catch(Exception ex)
    {
        throw ex;
    }
}

Answer 2

Close with:

form1.Dispose();

This will shut down the instance for good.

Answer 3

I do so and it works well:

Hide(); 
using (var homeScreen = new MdlHomeScreen())
{
  homeScreen.Closed += (s, args) => Close();
  homeScreen.ShowDialog();
}

Answer 4

Fastest way:

Application.OpenForms[1].Close();

The number inside the square bracket is the form you want to close...