How do I center a window onscreen in C#?
A single line:
this.Location = new Point((Screen.PrimaryScreen.WorkingArea.Width - this.Width) / 2,
(Screen.PrimaryScreen.WorkingArea.Height - this.Height) / 2);
Using the Property window
Select form → go to property window → select "start position" → select whatever the place you want.
Programmatically
Form form1 = new Form(); form1.StartPosition = FormStartPosition.CenterScreen; form1.ShowDialog();
Note: Do not directly call Form.CenterToScreen() from your code. Read here.
In Windows Forms:
this.StartPosition = FormStartPosition.CenterScreen;
In WPF:
this.WindowStartupLocation = WindowStartupLocation.CenterScreen;
That's all you have to do...
Use Form.CenterToScreen() method.