List and exception handling in c#

faq.txt

Q1) How to create a 2d array in list?
ans: List<List< data_type>> 2dlist = new List<List< data_type>>();
     2dlist.Add(new List<data_type>())

Q2) How can we raise an exception in c#?
ans: We can raise an exception manually in c# using the throw keyword.

Q3) How to get the number of element in a nth dimension of a List?
ans: We can get the number of element by this statement list[n-1].Count;

Q4) What does finally block do?
ans: The code under the finally block will execute whether the try block raise exception or not.

maq.txt

Q1. What will be the output of the statement?

        List<List<int>> matrix = new List<List< int>>();
        matrix.Add(new List<int>());
        matrix[0].AddRange(new int[] {1,2,3,4,5,6,7,8,9});
        matrix.Add(new List<int>());
        matrix[1].AddRange(new int[] {10,11,12,13,14,15,16,17,18,19});
        Console.WriteLine(matrix.Count);
        
a) 10
b) 9
c) 2
d) error

ans: c) 2

Q2. what will be the output of the code?

     try{
            int c=10/2;
            Console.WriteLine(c/0);
        }
        catch(DivideByZeroException ex)
        {
            Console.WriteLine("Don't divide by zero");
        }
        catch(Exception ex)
        {
            Console.WriteLine("There should not be any zero");
            Console.WriteLine("bye");
        }
        finally
        {
            Console.WriteLine("Don't give zero");
        }
        
a) Don't divide by zero
   Don't give zero

b) Don't divide by zero
   There should not be any zero
   bye
   Don't give zero

c) Don't divide by zero
   There should not be any zero
   bye
   
d) There should not be any zero
   bye
   Don't give zero
   
ans: a)

Q3) Select the correct option of this statement?
    
     List<int> nn=new List<int>(new int [] {1,2,3,4,5});
     Console.WriteLine(nn.Length);
     
a) 4
b) 5
c) List can't be assigned in this way 
d) none of the above

ans: d)

Q4) Which is the correct way to insert an array in a list at a particular index.
    
a) list.Add(index,array)
b) list.AddRange(index,array)
c) list.Insert(index,array)
d) list.InsertRange(index,array)

ans: d)