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C# Programming :: Namespaces

Namespaces - General Questions

  1. Which of the following statements are correct about a namespace used in C#.NET?

    1. Classes must belong to a namespace, whereas structures need not.
    2. Every class, struct, enum, delegate and interlace has to belong to some or the other namespace.
    3. All elements of the namespace have to belong to one file.
    4. If not mentioned, a namespace takes the name of the current project.
    5. The namespace should be imported to be able to use the elements in it.

    2. A.
    1, 3
    B.
    2, 4, 5
    C.
    3, 5
    D.
    4 only

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    Workspace

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  2. Which of the following CANNOT belong to a C#.NET Namespace?

    3. A.
    class
    B.
    struct
    C.
    enum
    D.
    Data
    E.
    interface

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    Workspace

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  3. Which of the following statements is correct about a namespace used in C#.NET?

    4. A.
    Nested namespaces are not allowed.
    B.
    Importing outer namespace imports inner namespace.
    C.
    Nested namespaces are allowed.
    D.
    If nested, the namespaces cannot be split across files.

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    Workspace

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  4. Which of the following C#.NET code snippets will correctly print "Hello C#.NET"?

    5. A. 
     import System; 
 namespace FresherGateConsoleApplication
 {   
     class MyProgram  
     {       
         static void Main(string[] args)      
         {             
             Console.WriteLine("Hello C#.NET");           
         }   
     } 
 }
    B. 
     using System;
 namespace FresherGateConsoleApplication
 {    
     class MyProgram  
     {      
        static void Main(string[ ] args)    
        {         
           WriteLine("Hello C#.NET");     
        }     
    }  
 }
    C. 
      using System.Console;
  namespace FresherGateConsoleApplication
  {    
      class MyProgram   
      {       
         static void Main (string[ ] args)    
         {         
            WriteLine("Hello C#.NET");      
         }  
      }
   }
    D. 
     using System;
 namespace FresherGateConsoleApplication
 {   
      class MyProgram 
      {       
          static void Main(string[] args)   
          {       
              Console.WriteLine("Hello C#.NET");            
          } 
      }
   }

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    Workspace

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  5. If ListBox is class present in System.Windows.Forms namespace, then which of the following statements are the correct way to create an object of ListBox Class?

    1.   using System.Windows.Forms;
  ListBox lb = new ListBox();
    2.   using LBControl = System.Windows.Forms;   
  LBControl lb = new LBControl();
    3.   System.Windows.Forms.ListBox lb = new  
  zzzSystem.Windows.Forms.ListBox();
    4.   using LBControl lb = new   
  System.Windows.Forms.ListBox;
    5.   using    
  LBContrSystem.Windows.Forms.ListBox;    
  LBControl lb = new LBControl();

    6. A.

    1, 3
    B.

    2, 4, 5
    C.

    1, 3, 5
    D.

    5 only

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    Workspace

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