Namespaces - General Questions

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 System.Windows.Forms.ListBox();

4 using LBControl lb = new System.Windows.Forms.ListBox;

5 using LBControl = System.Windows.Forms.ListBox;
LBControl lb = new LBControl();

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

Answer: Option C

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

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

Answer: Option D

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

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.

Answer: Option C

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

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

Answer: Option D

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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.

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

Answer: Option B

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Which of the following statements is correct about the using statement used in C#.NET?

A.	using statement can be placed anywhere in the C#.NET source code file.
B.	It is permitted to define a member at namespace level as a using alias.
C.	A C#.NET source code file can contain any number of using statement.
D.	By using using statement it is possible to create an alias for the namespace but not for the namespace element.
E.	By using using statement it is possible to create an alias for the namespace element but not for the namespace.

Answer: Option C

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Which of the following is correct way to rewrite the C#.NET code snippet given below?

using Microsoft.VisualBasic;
using System.Windows.Forms;
MessageBox.Show("Wait for a" + ControlChars.CrLf + "miracle");

A.	using System.Windows.Forms; using CtrlChars = Microsoft.VisualBasic.ControlChars; MessageBox.Show("Wait for a" + CrLf + "miracle");
B.	using Microsoft.VisualBasic; using System.Windows.Forms; CtrlChars = ControlChars; MessageBox.Show("Wait for a" + CtrlChars.CrLf + "miracle");
C.	using Microsoft.VisualBasic; using System.Windows.Forms; CtrlChars = ControlChars; MessageBox.Show ("Wait for a" + CrLf + "miracle");
D.	using System.Windows.Forms; using CtrlChars = Microsoft.VisualBasic.ControlChars; MessageBox.Show("Wait for a" + CtrlChars.CrLf + "miracle");

Answer: Option D

Explanation:

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Which of the following statements is correct about namespaces in C#.NET?

A.	Namespaces can be nested only up to level 5.
B.	A namespace cannot be nested.
C.	There is no limit on the number of levels while nesting namespaces.
D.	If namespaces are nested, then it is necessary to use using statement while using the elements of the inner namespace.
E.	Nesting of namespaces is permitted, provided all the inner namespaces are declared in the same file.

Answer: Option C

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Namespaces - General Questions

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