public void initialize()
 {
     _md5 = new  MD5CngClass();
 }
 public void finalize()
 {
     _md5 = null;
 }
 public void initialize()
 {
     _md5 = new SHA1CngClass();
 }
 public void initialize()
 {
     _md5 = new SHA1ManagedClass();
 }
 public void initialize()
 {
     _md5 = new MD5AsyncClass();
 }
 public void initialize()
 {
     _md5 = MD5ClassLock.GetInstance();
 }