How to top any windows window

In the forum, someone asked how to top any windows window. Here, we can use the Windows API function setwindowspos. The following is the sample code:

The sample code demonstrates setting a newly opened Notepad program to the top

1 [dllimport ("user32.dll", setlasterror = true)]
2 public static extern intptr findwindow (string lpclassname, string lpwindowname );
3
4 [dllimport ("user32.dll")]
5 public static extern bool setwindowpos (intptr hwnd, intptr hwndinsertafter, int X, int y, int CX, int cy, uint uflags );
6
7 public static readonly intptr hwnd_topmost = new intptr (-1); // top the form
8 public static readonly intptr hwnd_notopmost = new intptr (-2); // unstick the form
9 Public const uint swp_nomove = 0x0002; // do not adjust the form position
10 public const uint swp_nosize = 0x0001; // do not adjust the form size
11
12 private void button#click (Object sender, eventargs E)
13 {
14 // find the default Notepad program
15 intptr notepadhandle = findwindow (null, "untitled-Notepad ");
16 if (notepadhandle = NULL | notepadhandle = intptr. Zero)
17 return;
18 setwindowpos (notepadhandle, hwnd_topmost, 1, 1, 1, 1, swp_nomove | swp_nosize );
19}