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copied!<p>This isn't directly supported by the .NET Form class, so you have two options:</p> <p>1) Use the Win32 API <a href="http://msdn.microsoft.com/en-us/library/ms633545(VS.85).aspx" rel="nofollow noreferrer"><code>SetWindowPos</code></a> function.</p> <p><a href="http://www.pinvoke.net/default.aspx/user32.SetWindowPos" rel="nofollow noreferrer">pinvoke.net</a> shows how to declare this for use in C#:</p> <pre><code>[DllImport("user32.dll")] static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags); static readonly IntPtr HWND_BOTTOM = new IntPtr(1); const UInt32 SWP_NOSIZE = 0x0001; const UInt32 SWP_NOMOVE = 0x0002; const UInt32 SWP_NOACTIVATE = 0x0010; </code></pre> <p>So in your code, call:</p> <pre><code>SetWindowPos(Handle, HWND_BOTTOM, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE); </code></pre> <p>As you commented, this moves the form to the bottom of the z-order but doesn't keep it there. The only workaround I can see for this is to call <code>SetWindowPos</code> from the <code>Form_Load</code> and <code>Form_Activate</code> events. If your application is maximized and the user is unable to move or minimise the form then you might get away with this approach, but it's still something of a hack. Also the user might see a slight "flicker" if the form gets brought to the front of the z-order before the <code>SetWindowPos</code> call gets made.</p> <hr> <p>2) <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.wndproc.aspx" rel="nofollow noreferrer">subclass the form</a>, override the <code>WndProc</code> function and intercept the <a href="http://msdn.microsoft.com/en-us/library/ms632653(VS.85).aspx" rel="nofollow noreferrer">WM_WINDOWPOSCHANGING</a> Windows message, setting the SWP_NOZORDER flag (taken from <a href="https://stackoverflow.com/questions/595888/how-to-prevent-a-control-from-changing-z-order/1133181#1133181">this page</a>).</p>

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