Rotating Sprite Objects on DirectDraw Wrapper for C#

using System;
using System.Drawing;
using Microsoft.DirectX;
using Microsoft.DirectX.DirectDraw;
using DDW.DRAW;

namespace DDW.ENGINE
{
	public class CWorld
	{
		public string m_Name;
		public DDW.ENGINE.CEngine m_Engine=null;

		public Microsoft.DirectX.DirectDraw.Device m_Device=null;

		public DDW.DEBUG.CTrace m_Trace=null;

		public DDW.DRAW.CSprite m_SPR_BackDrop=null;

		public string m_WorldFileName="";
		public string m_WorldName="";


		public CWorld(CEngine e)
		{
			m_Engine=e;
			if (this.m_Trace==null)
				this.m_Trace = new DDW.DEBUG.CTrace();
		}
		~CWorld()
		{
		}

		public System.Exception Create(string filename, string worldname)
		{
			try
			{
				m_SPR_BackDrop = new DDW.DRAW.CSprite(m_Engine.m_Device.m_Device);
				m_SPR_BackDrop.Load("spr green","green01.bmp");
				m_SPR_BackDrop.m_Width=512;
				m_SPR_BackDrop.m_Heigth=512;
				return null;
			}
			catch(Exception e)
			{
				this.m_Trace.T("CWorld::Create>"+e);
				return e;
			}
		}

		public System.Exception Draw(Microsoft.DirectX.DirectDraw.Surface s)
		{
			try
			{
				s.Draw(
					new Rectangle(
						0,
						0,
						1280,
						1024
					),
					m_SPR_BackDrop.m_Surface.m_Surface,
					new Rectangle(
						0,
						0,
						m_SPR_BackDrop.m_Width,
						m_SPR_BackDrop.m_Heigth
					),
					DrawFlags.KeySource|DrawFlags.Wait
				);
				return null;
			}
			catch(Exception e)
			{
				this.m_Trace.T("CWorld::Draw>"+e);
				return e;
			}
		}
	}
}