C# Signature:

[DllImport("coredll.dll")]
private static extern bool SetForegroundWindow (IntPtr hWnd);

VB Signature:

Private Declare Function SetForegroundWindow Lib "coredll" (hWnd as IntPtr) As Boolean

User-Defined Types:

None.

Alternative Managed API:

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Notes:

None.

Tips & Tricks:

Note this tip from the Microsoft documentation:

If the window being set to the foreground is minimized, the window may not be visible to the end user. This function also does not reactivate the last active child window by default. To ensure that the window is restored and the last active child window is reactivated, combine the handle to the window with 0x01 using the logical OR operator

E.g. SetForegroundWindow((HWND)(((ULONG) hwnd) | 0x01) );

Sample Code:

[DllImport ("coredll.dll")]
private static extern bool SetForegroundWindow (IntPtr hWnd);

[DllImport ("coredll.dll")]
private static extern IntPtr GetDesktopWindow ();

private void SendToBack ()
{
    SetForegroundWindow (GetDesktopWindow ());
}