Display form on extended screen

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I want to display the form on the extended monitor. Below is my code after clicking a button:

C#

primaryDisplay = Screen.AllScreens.ElementAtOrDefault(0);
extendedDisplay = Screen.AllScreens.FirstOrDefault(s => !s.Equals(primaryDisplay)) ?? primaryDisplay;
this.StartPosition = FormStartPosition.Manual;
this.Location = extendedDisplay.Bounds.Location;
this.Show();

However, the form is still displayed on the primary one. What is wrong in my code? Thanks.

What I have tried:

Display Form on Extended Screen not successful

Posted 26-Sep-17 3:09am

s yu

Updated 26-Sep-17 3:51am

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OriginalGriff · Accepted Answer · 2017-09-26T03:50:00

The order in which the screens are returned is not defined anywhere I can see: you need to check the Screen.Primary Property (System.Windows.Forms)[^] rather than rely on the first in the colection:

C#

primaryDisplay = Screen.AllScreens.FirstOrDefault(s => s.Primary);
extendedDisplay = Screen.AllScreens.FirstOrDefault(s => !s.Primary) ?? primaryDisplay;
StartPosition = FormStartPosition.Manual;
Location = extendedDisplay.Bounds.Location;
Show();