C# Namespace Test - Sanfoundry

1. If ListBox is the class of System.Windows.Forms namespace. Then, the correct way to create an object of ListBox class is?

using System.Windows.Forms;
ListBox I = new ListBox();

All of the mentioned

using LBControl I = new System.Windows.Forms.ListBox;

System.Windows.Forms.ListBox I = new System.Windows.Forms.ListBox();

2. Which among the given is not a correct way to call the method Issue() defined in the following C# code snippet?

class Book
{
    public void issue()
    {
      /* code */
    }
}
class Journel
{
     public void issue()
     {
         /* code */
     }
}

Book b = new Book();
b.issue();

using College.Lib;
Book b = new Book();
b.issue();

All of the mentioned

College.Lib.Book b = new College.Lib.Book();
b.issue();

3. Which among the following is a .NET namespace?

System.Web

System.Drawing2D

System.Process

System.Drawing3D

4. Which among the following is the correct statement about the using statement used in C#.NET?

A C#.NET source code file consists of any number of using statement

Using statement can be placed anywhere in the C#.NET source code file

By using 'using' statement it's possible to create an alias for the namespace but not for the namespace element

It is permitted to define a member at namespace level using alias

5. If a class named csharp is present in namespace n1 as well as in namespace n2, then which of the following is the correct way to use csharp class?

   class Program
   {
     static void Main(string[] args)
     {
        import n1;
        csharp x = new csharp();
        x.fun();
        import n2;
        csharp y = new csharp();
        y.fun();
     }
   }

   class Program
   {
     static void Main(string[] args)
     {
       using n1;
       csharp x = new csharp();
       x.fun();
       using n2;
       csharp y = new csharp();
        y.fun();
     }
   }

   using n1;
   using n2;
   namespace ConsoleApplication1
   {
      class Program
   {
     static void Main(string[] args)
     {
        
       n1.csharp x = new n1.csharp();
        x.fun();
        import n2;
        n2.csharp y = new n2.csharp();
        y.fun();
     }
   }
}

   import n1;
   import n2;
   namespace ConsoleApplication1
   {
      class Program
   {
     static void Main(string[] args)
     {
        
       n1.csharp x = new n1.csharp();
        x.fun();
        import n2;
        n2.csharp y = new n2.csharp();
        y.fun();
     }
   }
}

6. Which is the correct statement about the namespaces in C#.NET?

There is no limit on the number of levels while nesting namespaces

Nesting of namespaces is permitted, provided all the inner namespaces are declared in the same file

All of the mentioned

A namespace cannot be tested

7. Which among the following is a correct statement about namespace used in C#.NET?

All elements of the namespace must to belong to one file

If not mentioned, a namespace takes the name of the current project

Classes must belong to a namespace, whereas structures need not

All of the mentioned

8. Which of the following is not a namespace in the .NET Framework Class Library?

System.Threading

System.Security

System.Process

System.xml

9. Which among the following does not belong to the C#.NET namespace?

class

struct

enum

data

10. Which among the following statements are not correct about a namespace used in C#.NET?

Nested namespaces are allowed

Importing outer namespace does not import inner namespace

Importing outer namespaces imports inner namespace