public  class  Bmp2Jpeg 
           { 
                       private  long  lQuality=50L; 
                       private  ImageCodecInfo  myImageCodecInfo; 
                       private            EncoderParameters  myEncoderParameters; 
                       public  Bmp2Jpeg(long  Quality) 
                       { 
                                   lQuality=Quality; 
                                   Ini(); 
                       } 
                       private  void  Ini() 
                       { 
                                   System.Drawing.Imaging.Encoder  myEncoder; 
                                   EncoderParameter  myEncoderParameter; 
                                   myImageCodecInfo  =  GetEncoderInfo("image/jpeg"); 
                                   myEncoder  =  System.Drawing.Imaging.Encoder.Quality; 
                                   myEncoderParameters  =  new  EncoderParameters(1); 
                                   myEncoderParameter  =  new  EncoderParameter(myEncoder,lQuality); 
                                   myEncoderParameters.Param[0]  =  myEncoderParameter;