2011.03.03 How to rotate FONT or PICTURE in C Sharp language

Graphics g = this.CreateGraphics(); 
Matrix x = new Matrix(); 
x.Rotate(45, MatrixOrder.Append); 
g.Transform = x; 
g.DrawString( "字符串 ", this.Font, SystemBrushes.ControlText, 0, 0); 
g.ResetTransform();

图像Graphics.TranslateTransform  
string filePath =@"C:\a.jpg";  
  using (Bitmap bm = new Bitmap(500,500))  
  {  
  using (Graphics g = Graphics.FromImage(bm))  
  {  
  g.Clear(Color.Wheat);  
  g.TranslateTransform(0, 0, MatrixOrder.Prepend);  
  g.RotateTransform(45);  
  FontFamily ff = new FontFamily("宋体");  
  Font f =new Font(ff,10);  
  Brush b = new SolidBrush(Color.Black);  
  StringFormat sf = new StringFormat();  
  g.DrawString("", f, b, new PointF(10, 10), sf);  
  g.DrawString("", f, b, new PointF(10, 10 + 30 + 10), sf);  
  }  
  bm.Save(filePath, ImageFormat.Jpeg);  
  }