Udooz.net

 
public class Exam
{
        public string Title { get; private set; }
        public Level Level { get; private set; }
        public List Questions { get; private set; }
        
        public Exam(string title, Level level)
        {
                Title = title;
                Level = level;
                Question.QNo = 1;
                Questions = new List();
        }
        
        public void AddQuestion(Question question)
        {
                if (!Questions.Contains(question))
                        Questions.Add(question);
        }
 
        public void VerifyAnswers(ref Dictionary answers)
        {
                foreach (KeyValuePair answer in answers)
                {
                        Question question = Questions.Find(q => q.Number == answer.Key);
                        if (question.Answer.SequenceEqual(answer.Value.Answer))
                                answer.Value.IsCorrect = true;
                        else
                        {
                                answer.Value.IsCorrect = false;
                                answer.Value.CorrectAnswer = question.Answer;
                        }   
                }
        }
}
 

 
public class Question : IEquatable
{        
        internal static ushort QNo { get; set; }        
 
        public ushort Number { get; private set; }
        public string Description { get; private set; }
        public Dictionary Options { get; private set; }
        public List Answer { get; private set; }
 
        public Question(string description)
        {
                Number = QNo++;
                Description = description;
                Options = new Dictionary(4);            
        }
 
        public void AddOption(string choice, string descripton)
        {            
                if (!Options.ContainsKey(choice))
                        Options.Add(choice, descripton);
        }
 
        public void AddAnswers(string[] choices)
        {
                Answer = choices.Distinct().ToList();
        }
 
        public override bool Equals(object obj)
        {            
                if (ReferenceEquals(this, obj)) return true;
                if (obj == null || !(obj is Question)) return false;
                Question other = obj as Question;
 
                return Number == other.Number &&
                        Description.Equals(other.Description) &&
                        Options.Equals(other.Options) &&
                        Answer.Equals(other.Answer);
        }
 
        public override int GetHashCode()
        {
                return Number.GetHashCode() ^ 786 ^
                        Description.GetHashCode() ^ Options.GetHashCode() ^
                        Answer.GetHashCode();
        }
 
        #region IEquatable Members
 
        public bool Equals(Question other)
        {
                if (ReferenceEquals(this, other)) return true;
                if (other == null) return false;
 
                return Number == other.Number &&
                        Description.Equals(other.Description) &&
                        Options.Equals(other.Options) &&
                        Answer.Equals(other.Answer);
        }
 
        #endregion
}

 
var dotnetExam = new Exam(".NET Fundamentals", Level.Beginner);
Question question = new Question("Expansion of CLR");
question.AddOption("A", "Common Language Runtime");
question.AddOption("B", "Common LINQ Runtime");
question.AddOption("C", "C# Language Runtime");
question.AddOption("D", "C Language Runtime");
question.AddAnswers(new string[] { "A" });
dotnetExam.AddQuestion(question);