User32.dll SystemParametersInfo method problem.

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C#

.NET

Win32

Hey there,
I've been using this fabulous function from Microsoft user32

[DllImport("user32.dll")]
private static extern void SystemParametersInfo(int uAction, int wParam, string Address, int exParam);

Everything is working fine when I use this function for changing user desktop wallpaper but I want to use the fade effect which is being done in Windows 7.

Please help me if there is any code of API function available.

Thanks in advance.
:)