Shell32.cs

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Runtime.InteropServices;

public class Shell32  
{
	
	public const int 	MAX_PATH = 256;
	[StructLayout(LayoutKind.Sequential)]
		public struct SHITEMID
	{
		public ushort cb;
		[MarshalAs(UnmanagedType.LPArray)]
		public byte[] abID;
	}

	[StructLayout(LayoutKind.Sequential)]
		public struct ITEMIDLIST
	{
		public SHITEMID mkid;
	}

	[StructLayout(LayoutKind.Sequential)]
		public struct BROWSEINFO 
	{ 
		public IntPtr		hwndOwner; 
		public IntPtr		pidlRoot; 
		public IntPtr 		pszDisplayName;
		[MarshalAs(UnmanagedType.LPTStr)] 
		public string 		lpszTitle; 
		public uint 		ulFlags; 
		public IntPtr		lpfn; 
		public int			lParam; 
		public IntPtr 		iImage; 
	} 

	// Browsing for directory.
	public const uint BIF_RETURNONLYFSDIRS   =	0x0001;
	public const uint BIF_DONTGOBELOWDOMAIN  =	0x0002;
	public const uint BIF_STATUSTEXT         =	0x0004;
	public const uint BIF_RETURNFSANCESTORS  =	0x0008;
	public const uint BIF_EDITBOX            =	0x0010;
	public const uint BIF_VALIDATE           =	0x0020;
	public const uint BIF_NEWDIALOGSTYLE     =	0x0040;
	public const uint BIF_USENEWUI           =	(BIF_NEWDIALOGSTYLE | BIF_EDITBOX);
	public const uint BIF_BROWSEINCLUDEURLS  =	0x0080;
	public const uint BIF_BROWSEFORCOMPUTER  =	0x1000;
	public const uint BIF_BROWSEFORPRINTER   =	0x2000;
	public const uint BIF_BROWSEINCLUDEFILES =	0x4000;
	public const uint BIF_SHAREABLE          =	0x8000;

	[StructLayout(LayoutKind.Sequential)]
		public struct SHFILEINFO
	{ 
		public const int NAMESIZE = 80;
		public IntPtr	hIcon; 
		public int		iIcon; 
		public uint	dwAttributes; 
		[MarshalAs(UnmanagedType.ByValTStr, SizeConst=MAX_PATH)]
		public string szDisplayName; 
		[MarshalAs(UnmanagedType.ByValTStr, SizeConst=NAMESIZE)]
		public string szTypeName; 
	};

	public const uint SHGFI_ICON				= 0x000000100;     // get icon
	public const uint SHGFI_DISPLAYNAME			= 0x000000200;     // get display name
	public const uint SHGFI_TYPENAME          	= 0x000000400;     // get type name
	public const uint SHGFI_ATTRIBUTES        	= 0x000000800;     // get attributes
	public const uint SHGFI_ICONLOCATION      	= 0x000001000;     // get icon location
	public const uint SHGFI_EXETYPE           	= 0x000002000;     // return exe type
	public const uint SHGFI_SYSICONINDEX      	= 0x000004000;     // get system icon index
	public const uint SHGFI_LINKOVERLAY       	= 0x000008000;     // put a link overlay on icon
	public const uint SHGFI_SELECTED          	= 0x000010000;     // show icon in selected state
	public const uint SHGFI_ATTR_SPECIFIED    	= 0x000020000;     // get only specified attributes
	public const uint SHGFI_LARGEICON         	= 0x000000000;     // get large icon
	public const uint SHGFI_SMALLICON         	= 0x000000001;     // get small icon
	public const uint SHGFI_OPENICON          	= 0x000000002;     // get open icon
	public const uint SHGFI_SHELLICONSIZE     	= 0x000000004;     // get shell size icon
	public const uint SHGFI_PIDL              	= 0x000000008;     // pszPath is a pidl
	public const uint SHGFI_USEFILEATTRIBUTES 	= 0x000000010;     // use passed dwFileAttribute
	public const uint SHGFI_ADDOVERLAYS       	= 0x000000020;     // apply the appropriate overlays
	public const uint SHGFI_OVERLAYINDEX      	= 0x000000040;     // Get the index of the overlay

	public const uint FILE_ATTRIBUTE_DIRECTORY  = 0x00000010;  
	public const uint FILE_ATTRIBUTE_NORMAL     = 0x00000080;  

	[DllImport("Shell32.dll")]
	public static extern IntPtr SHGetFileInfo(
		string pszPath,
		uint dwFileAttributes,
		ref SHFILEINFO psfi,
		uint cbFileInfo,
		uint uFlags
		);
}

public class User32
{
	/// <summary>
	/// Provides access to function required to delete handle. This method is used internally
	/// and is not required to be called separately.
	/// </summary>
	/// <param name="hIcon">Pointer to icon handle.</param>
	/// <returns>N/A</returns>
	[DllImport("User32.dll")]
	public static extern int DestroyIcon( IntPtr hIcon );
}