how to close form1 when i open form2?

[RudiVisser]

Oh, no

I did follow your code But I got a error, you can see in my attach Image.

According to some tutorials that is the preferred method.

I got the same error as you.

Try digging into your mind

[tr333]

read this: http://vbforums.com/showthread.php?t=313050
its written for vb.net, but the ideas are the same...

basically you want to declare the reference to the new form as a public variable, something which cannot be done inside a method.

public Form newform = null;

public static void Main() {
...

then you can use the code that was first posted (slightly modified):

// newform has already been declared as a public variable
newform = new Form2();
newform.Show();
this.Close();

since the new form is no longer a child of the loginform, it won't disappear when the loginform is closed.

[RudiVisser]

read this: http://vbforums.com/showthread.php?t=313050
its written for vb.net, but the ideas are the same...

basically you want to declare the reference to the new form as a public variable, something which cannot be done inside a method.

public Form newform = null;

public static void Main() {
...

then you can use the code that was first posted (slightly modified):

// newform has already been declared as a public variable
newform = new Form2();
newform.Show();
this.Close();

since the new form is no longer a child of the loginform, it won't disappear when the loginform is closed.

I've tried placing a public declaration of a form EVERYWHERE, and it just doesn't work.

I've put it in a class, before a class, before main, and got a million errors.

It works when I put it in a class, however because I have to recreate the class in the form, it closes that form and the current form also:

class variables
    {
        public string windowsuser;
        public mainos osform = new mainos();
    }

In form1:

timer4.Enabled = false;
            vars.osform = new mainos();
            vars.osform.Show();
            this.Close();

[tr333]

i looked at one of my old projects as to how i did this, and it was surprisingly simple...

public System.Windows.Forms.Form LoginForm = new frmLogin // create new login form
public System.Windows.Forms.Form MainForm; // don't create yet

public static void Main() {
    MainForm = new frmMain; // create new main form
    Application.Run(LoginForm);
    Application.Run(MainForm);
    Application.Exit();
}