CODE EXAMPLE FOR CSHARP

shell32.dll c# example

 private static void advanceBackgroundSlider()
 {
     //Display the Desktop via the COM component Shell32.dll
     Shell32.Shell objShell = new Shell32.Shell();
     objShell.ToggleDesktop();
     // Simulate Ctrl + Space to deselect anything that may be selected
     SendKeys.SendWait("^( )");
     // Simulate pressing Shift + F10 to open Desktop context menu
     SendKeys.SendWait("+{F10}");
     // Simulate pressing N to execute the “Next desktop background” command
     SendKeys.SendWait("{N}");
 }