// זיהוי משתמש
 internal bool authenticate(string userName, string password)
 {
     userDetails = userHandler.GetUsersByUserNameAndPassword(userName, password);
     if (userDetails != null)
     {
         if (userDetails.PictureID > 0)
         {
             Picture picture = pictureHandler.GetBusinessEntityById(userDetails.PictureID);
             if (picture != null)
             {
                 ImageConverter converter = new ImageConverter();
                 image = (Image)converter.ConvertFrom(picture.Img);
             }
         }
         return(true);
     }
     else
     {
         return(false);
     }
 }