Using Windows Explorer Progress Dialog In Your Application

//	#if (_WIN32_IE >= 0x0500)
//	/// IProgressDialog
//	// {F8383852-FCD3-11d1-A6B9-006097DF5BD4}
//	DEFINE_GUID(CLSID_ProgressDialog,       0xf8383852, 0xfcd3, 0x11d1, 0xa6, 0xb9, 0x0, 0x60, 0x97, 0xdf, 0x5b, 0xd4);
//	// {EBBC7C04-315E-11d2-B62F-006097DF5BD4}
//	DEFINE_GUID(IID_IProgressDialog,        0xebbc7c04, 0x315e, 0x11d2, 0xb6, 0x2f, 0x0, 0x60, 0x97, 0xdf, 0x5b, 0xd4);
//	#endif // _WIN32_IE >= 0x0500

[ComImport, Guid("F8383852-FCD3-11d1-A6B9-006097DF5BD4")] 
public class ProgressDialog {
 
	/// <summary>
	/// Flags for IProgressDialog::StartProgressDialog() (dwFlags)
	/// </summary>
	public enum Flags : uint {
		PROGDLG_NORMAL          = 0x00000000,      // default normal progress dlg behavior
		PROGDLG_MODAL           = 0x00000001,      // the dialog is modal to its hwndParent (default is modeless)
		PROGDLG_AUTOTIME        = 0x00000002,      // automatically updates the "Line3" text with the "time remaining" (you cant call SetLine3 if you passs this!)
		PROGDLG_NOTIME          = 0x00000004,      // we dont show the "time remaining" if this is set. We need this if dwTotal < dwCompleted for sparse files
		PROGDLG_NOMINIMIZE      = 0x00000008,      // Do not have a minimize button in the caption bar.
		PROGDLG_NOPROGRESSBAR   = 0x00000010       // Don't display the progress bar
	}
 
	/// <summary>
	/// Time Actions (dwTimerAction)
	/// </summary>
	public const uint PDTIMER_RESET	= 0x00000001;
 
}

[ComImport]
[Guid("EBBC7C04-315E-11d2-B62F-006097DF5BD4")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IProgressDialog {
 
	void StartProgressDialog( 
		/*HWND */		IntPtr	hwndParent, 
		[MarshalAs(UnmanagedType.IUnknown)]
		/*IUnknown* */	object	punkEnableModless, 
		/*DWORD */		uint	dwFlags, 
		/*LPCVOID */	IntPtr	pvResevered
		);
 
	void StopProgressDialog();
 
	void SetTitle( 
		[MarshalAs(UnmanagedType.LPWStr)]
		/*LPCWSTR */	string pwzTitle 
		);
 
	void SetAnimation( 
		/*HINSTANCE */	IntPtr hInstAnimation, 
		/*UINT */		ushort idAnimation
		);
 
	[return: MarshalAs(UnmanagedType.Bool)]
	bool HasUserCancelled();
 
	void SetProgress( 
		/*DWORD */		uint dwCompleted, 
		/*DWORD */		uint dwTotal
		);
	void SetProgress64( 
		/*ULONGLONG */	ulong ullCompleted, 
		/*ULONGLONG */	ulong ullTotal
		);
 
	void SetLine(
		/*DWORD */		uint	dwLineNum, 
		[MarshalAs(UnmanagedType.LPWStr)]
		/*LPCWSTR */	string pwzString, 
		[MarshalAs(UnmanagedType.Bool)]
		/*BOOL */		bool	fCompactPath, 
		/*LPCVOID */	IntPtr	pvResevered
		);
 
	void SetCancelMsg( 
		[MarshalAs(UnmanagedType.LPWStr)]
		/*LPCWSTR */	string pwzCancelMsg, 
		/*LPCVOID */	object pvResevered
		);
 
	void Timer( 
		/*DWORD */		uint	dwTimerAction, 
		/*LPCVOID */	object	pvResevered
		);
 
}

IntPtr phndl = LoadLibraryEx( 
	"shell32.dll\0", 
	null, 
	DONT_RESOLVE_DLL_REFERENCES | LOAD_LIBRARY_AS_DATAFILE 
	);