this.Location = Screen.AllScreens[1].WorkingArea.Location;

Question

So the code is:

this.Location = Screen.AllScreens[1].WorkingArea.Location;

problem Message "Index was outside the bounds of the array." string

Answer 1

Index was outside the bounds of the array

Arrays start at zero.

Change your code to this

this.Location = Screen.AllScreens[0].WorkingArea.Location;