表单隐藏在Visual Studio中不起作用

Question

I just started Visual Studio and I tried opening another form using a button and it worked well but the hide code to hide the first form doesn't seem work. Here's my code (Login = form1, Interface = form2):

private void login_button_Click(object sender, EventArgs e)
    {
        Login login_f = new Login();
        Interface interface_f = new Interface();
        login_f.Hide();
        interface_f.Show();
    }

Answer 1

What is going on:

Exactly what's been written.

1. A button on an existing Login form is clicked
2. A new Login from is created and stored into login_f variable.
3. A new Interface from is created and stored into interface_f variable.
4. interface_f becomes visible, login_f form becomes invisible. The very first form which has been actually clicked stays the same.

What to do: login_f variable should contain reference to the clicked form. This reference can be retrieved via this keyword.

private void login_button_Click(object sender, EventArgs e)
    {
        var login_f = this;
        Interface interface_f = new Interface();
        login_f.Hide();
        interface_f.Show();
    }