C# winform Show form in second screen and vice versa

Question

hi. I have an application in which there is a form which i wants to show on second screen.

Mean If application is running on screen A and when i click on menu to show Form it should display on Screen B and same with if application is running on screen B and when i click on menu to show Form it should display on Screen A.

please tell me how to do that. If you provide code then it will be better. i searched from net and found some articles to get primary and secondary screens. but unable to implement that.

Answer 1

Below is a function allowing you to display a form on any monitor. For your current scenario you can call this showOnMonitor(1);.

Essentially you have to get screen information from Screen.AllScreens and then get the dimensions of each, then place your form where you need it

function void showOnMonitor(int showOnMonitor) 
{ 
Screen[] sc; 
sc = Screen.AllScreens; 
//get all the screen width and heights 
Form2 f = new Form2(); 
f.FormBorderStyle = FormBorderStyle.None; 
f.Left = sc[showOnMonitor].Bounds.Width; 
f.Top = sc[showOnMonitor].Bounds.Height; 
f.StartPosition = FormStartPosition.Manual; 
f.Show(); 
}

Note don't forget to do validation to ensure you actually have two screens etc else an exception will be thrown for accessing sc[showOnMonitor]

Answer 2

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 != 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.