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Home C# Programming Collection Classes Comments

  • Question
  • In a HashTable Key cannot be null, but Value can be.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 


  • Collection Classes problems


    Search Results


    • 1. Which of the following is the correct way to access all elements of the Stack collection created using the C#.NET code snippet given below?

      Stack st = new Stack();
      st.Push(11);
      st.Push(22);
      st.Push(-53);
      st.Push(33);
      st.Push(66);

    • Options
    • A.
      IEnumerable e;
      e = st.GetEnumerator(); 
      while (e.MoveNext())
      Console.WriteLine(e.Current);
    • B.
      IEnumerator e;
      e = st.GetEnumerable(); 
      while (e.MoveNext())
      Console.WriteLine(e.Current);
    • C.
      IEnumerator e;
      e = st.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • D.
      IEnumerator e;
      e = Stack.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • Discuss
    • 2. Which of the following is the correct way to access all elements of the Queue collection created using the C#.NET code snippet given below?

      Queue q = new Queue(); 
      q.Enqueue("Sachin"); 
      q.Enqueue('A'); 
      q.Enqueue(false); 
      q.Enqueue(38); 
      q.Enqueue(5.4);

    • Options
    • A.
      IEnumerator e;
      e = q.GetEnumerator(); 
      while (e.MoveNext())
      Console.WriteLine(e.Current);
    • B.
      IEnumerable e;
      e = q.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • C.
      IEnumerator e;
      e = q.GetEnumerable(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • D.
      IEnumerator e;
      e = Queue.GetEnumerator(); 
      while (e.MoveNext()) 
      Console.WriteLine(e.Current);
    • Discuss
    • 3. A HashTable t maintains a collection of names of states and capital city of each state. Which of the following is the correct way to find out whether "Kerala" state is present in this collection or not?

    • Options
    • A. t.ContainsKey("Kerala");
    • B. t.HasValue("Kerala");
    • C. t.HasKey("Kerala");
    • D. t.ContainsState("Kerala");
    • E. t.ContainsValue("Kerala");
    • Discuss
    • 4. Which of the following is an ordered collection class?

      1. Map
      2. Stack
      3. Queue
      4. BitArray
      5. HashTable

    • Options
    • A. 1 only
    • B. 2 and 3 only
    • C. 4 and 5 only
    • D. All of the above
    • E. None of the above
    • Discuss
    • 5. In which of the following collections is the Input/Output index-based?

      1. Stack
      2. Queue
      3. BitArray
      4. ArrayList
      5. HashTable

    • Options
    • A. 1 and 2 only
    • B. 3 and 4 only
    • C. 5 only
    • D. 1, 2 and 5 only
    • E. All of the above
    • Discuss
    • 6. How many enumerators will exist if four threads are simultaneously working on an ArrayList object?

    • Options
    • A. 1
    • B. 3
    • C. 2
    • D. 4
    • E. Depends upon the Project Setting made in Visual Studio.NET.
    • Discuss
    • 7. Attributes can be applied to

      1. Method
      2. Class
      3. Assembly
      4. Namespace
      5. Enum

    • Options
    • A. 1 and 2 only
    • B. 1, 2 and 3
    • C. 4 and 5 only
    • D. All of the above
    • E. None of the above
    • Discuss
    • 8. Once applied which of the following CANNOT inspect the applied attribute?

    • Options
    • A. CLR
    • B. Linker
    • C. ASP.NET Runtime
    • D. Visual Studio.NET
    • E. Language compilers
    • Discuss
    • 9. Which of the following is the correct way of applying the custom attribute called Tested which receives two-arguments - name of the tester and the testgrade?

      1. Custom attribute cannot be applied to an assembly.
      2. [assembly: Tested("Sachin", testgrade.Good)]
      3. [Tested("Virat", testgrade.Excellent)]
        class customer { /* .... */ }
      4. Custom attribute cannot be applied to a method.
      5. Custom attribute cannot be applied to a class.

    • Options
    • A. 1 only
    • B. 1, 5
    • C. 2, 3
    • D. 4, 5
    • E. None of the above
    • Discuss
    • 10. Which of the following CANNOT be a target for a custom attribute?

    • Options
    • A. Enum
    • B. Event
    • C. Delegate
    • D. Interface
    • E. Namespace
    • Discuss


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