public static extern Int32 SHGetStockIconInfo(SHSTOCKICONID siid, SHGSI uFlags, ref SHSTOCKICONINFO psii);

See SHSTOCKICONID, SHGSI and SHSTOCKICONINFO.

SHSTOCKICONINFO sii = new SHSTOCKICONINFO();

sii.cbSize = (UInt32) Marshal.SizeOf(typeof(SHSTOCKICONINFO));

    Dim sii As New SHSTOCKICONINFO()

    sii.cbSize = Marshal.SizeOf(GetType(SHSTOCKICONINFO))

public struct SHSTOCKICONINFO

    Public Structure SHSTOCKICONINFO