Showing a Windows Form on a Secondary Monitor

Showing a Windows form on a secondary monitor?

Try setting StartPosition parameter as FormStartPosition.Manual inside your SetFormLocation method.

Showing Winforms on dual-screen setup

Combining all answers here and in similar questions, the working solution for showing app on primary screen is this:

private void FormLogin_Load(object sender, EventArgs e)
    {
        this.Location = Screen.AllScreens[0].WorkingArea.Location;
        ReallyCenterToScreen();
     }
    protected void ReallyCenterToScreen()
    {
        Screen screen = Screen.FromControl(this);
        Rectangle workingArea = screen.WorkingArea;
        this.Location = new Point()
        {
            X = Math.Max(workingArea.X, workingArea.X + (workingArea.Width - this.Width) / 2),
            Y = Math.Max(workingArea.Y, workingArea.Y + (workingArea.Height - this.Height) / 2)
        };
    }

And to keep the MessageBoxes on the center screen is this:

MessageBox.Show(this, "Message")

Sources are the comment of @Bryce Wagner to my question, the answer from @Mohamad Shahrestani and from this question answer by @Sarsur.A

Window in fullscreen on second monitor

Going fullscreen on secondary monitor

    using System.Linq;
    using System.Windows;

    namespace ExtendedControls

{
    static public class WindowExt
    {

        // NB : Best to call this function from the windows Loaded event or after showing the window
        // (otherwise window is just positioned to fill the secondary monitor rather than being maximised).
        public static void MaximizeToSecondaryMonitor(this Window window)
        {
            var secondaryScreen = System.Windows.Forms.Screen.AllScreens.Where(s => !s.Primary).FirstOrDefault();

            if (secondaryScreen != null)
            {
                if (!window.IsLoaded)
                    window.WindowStartupLocation = WindowStartupLocation.Manual;

                var workingArea = secondaryScreen.WorkingArea;
                window.Left = workingArea.Left;
                window.Top = workingArea.Top;
                window.Width = workingArea.Width;
                window.Height = workingArea.Height;
                // If window isn't loaded then maxmizing will result in the window displaying on the primary monitor
                if ( window.IsLoaded )
                    window.WindowState = WindowState.Maximized;
            }
        }
    }
}

How do I ensure a form displays on the additional monitor in a dual monitor scenario?

You need to use the Screen class to find a screen that the original form is not on, then set the second form's Location property based on that screen's Bounds.

For example:

var myScreen = Screen.FromControl(originalForm);
var otherScreen = Screen.AllScreens.FirstOrDefault(s => !s.Equals(myScreen)) 
               ?? myScreen;
otherForm.Left = otherScreen.WorkingArea.Left + 120;
otherForm.Top = otherScreen.WorkingArea.Top + 120;

This will work for any number of screens.

Note that it is possible that the video card is configured so that Windows sees one large screen instead of two smaller ones, in which case this becomes much more difficult.

display window on secondary monitor

Ok, I've fixed the problem with remove the property WindowState="Maximized" in XAML code of MonitorWindow and changed the program as follows:

        Queue<string> itemQueue = new Queue<string>();

        MonitorWindow monitor = new MonitorWindow(itemQueue);

        var secondaryScreen = System.Windows.Forms.Screen.AllScreens.Where(s => !s.Primary).FirstOrDefault();

        if (secondaryScreen != null)
        {
            if (!monitor.IsLoaded)
                monitor.WindowStartupLocation = WindowStartupLocation.Manual;
            var workingArea = secondaryScreen.WorkingArea;
            monitor.Left = workingArea.Left;
            monitor.Top = workingArea.Top;
            monitor.Width = workingArea.Width;
            monitor.Height = workingArea.Height;
            // If window isn't loaded then maxmizing will result in the window displaying on the primary monitor
            monitor.Show();
            if (monitor.IsLoaded)
                monitor.WindowState = WindowState.Maximized;
        }

Have Winform appear on all existing monitors at same time (Its an alert window)

This one worked perfectly for me..

First create an alert form with a label inside.
set the label1 property -> Modifier = public

void showMsgOnAllScreens(string msg)
    {
        for (int i = 0; i < Screen.AllScreens.Length; i++)
        {
            AlertForm alert = new AlertForm();
            alert.label1.Text = msg;
            alert.StartPosition = FormStartPosition.Manual;
            alert.Location = new Point(
                Screen.AllScreens[i].Bounds.Left + (Screen.AllScreens[i].Bounds.Width / 2 - alert.Width / 2),
                Screen.AllScreens[i].Bounds.Height / 2 - alert.Height / 2);
            alert.Show();
        }
    }

.

.

.

Now simply call the method to show msgs on all screens..

void button1_click (object sender, EventArgs e)
{
    showMsgOnAllScreens("Warning.. Something's burning..!!");
}

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