Maximizing form on secondary screen with different resolution?

Question

I am developping a simple windows application (in C#) and I want it to display a form that is maximized in my second monitor. To do so, I am doing the following on the "Load" event of the form:

private void FormTest_Load(object sender, EventArgs e)
    {
        Screen[] screens = Screen.AllScreens;
        this.WindowState = FormWindowState.Normal;
        this.Location = screens[1].WorkingArea.Location;
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
        this.WindowState = FormWindowState.Maximized;                    
    }

The problem I have is that when I execute this, the form only takes part of the screen. My primary screen has a resolution of 1024x768 and my secondary screen has a resolution of 1920x1080, and it seems that the form is taking the size of the primary screen in my secondary screen.

Also, I have a button that runs the following code to maximize the screen or turn it back to normal:

private void ChangeSize() {
    if (this.WindowState == System.Windows.Forms.FormWindowState.Maximized)
    {
        this.WindowState = System.Windows.Forms.FormWindowState.Normal;
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
    }
    else
    {
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
        this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
    }
}

When I click on the button twice (first to de-maximize the form, and then to maximize it again) the form does cover the entire secondary screen perfectly, but if I try to just run that function in code twice (for the sake of testing) right after the code in "FormTest_Load", the screen will still not cover correctly the entire screen.

I am probably making a noob mistake here but I have struggled with this for some time, so I would really appreciate if anyone can shed some light on what is wrong with my code.

Answer 1

I've tried to get the same result as you describe (changing resolutions, etc), but all works fine in my computer and screens. May be... what is exactly the variable screens ? I've assumed that is Screen.AllScreens , like this:

    protected override void OnLoad(EventArgs e)
    {
        Screen[] screens = Screen.AllScreens;
        int screenNumber = 1;

        this.WindowState = FormWindowState.Normal;
        this.Location = screens[screenNumber].WorkingArea.Location;
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
        this.WindowState = FormWindowState.Maximized;
    }

As I said, it works fine for me. Also, you can check the screen settings of your computer: is the size of text and apps set to 100% (recommended value) ?