int GetDesktopItemOptions(ref COMPONENTSOPT pco, int dwReserved);

     int SetDesktopItemOptions(ref COMPONENTSOPT pco, int dwReserved);

    Function GetDesktopItemOptions(ByRef pco As COMPONENTSOPT, ByVal dwReserved As Integer) As Integer

    Function SetDesktopItemOptions(ByRef pco As COMPONENTSOPT, ByVal dwReserved As Integer) As Integer

COMPONENTSOPT opts = new COMPONENTSOPT();

opts.dwSize = COMPONENTSOPT.SizeOf;

public struct COMPONENTSOPT

     public static readonly int SizeOf = Marshal.SizeOf(typeof(COMPONENTSOPT));

Public Structure COMPONENTSOPT

    COMPONENTSOPT.SizeOf = Marshal.SizeOf(GetType(COMPONENTSOPT))

public struct COMPONENTSOPT

     public static readonly int SizeOf = Marshal.SizeOf(typeof(COMPONENTSOPT));

Structure COMPONENTSOPT