how to close form1 when i open form2?

[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();