C# Quiz Part-2

 C# Quiz Part-2

11. Can Abstract Class have Constructor?

 A. Yes
 B. No
 C. Can't say
 D. None of them

... Answer is A)
Yes, Abstract class can have constructor and also can cal from derived class

12. Static variable is called using class name but cannot be call static variable through object?

 A. True
 B. False
 C. Can't say
 D. None of there

... Answer is A)
True , Only one copy of static variable is create and used every where

13. In case of dynamic variable ?

 A. Type of variable can be decided at compile time or run time
 B. Type of the variable is decided at compile time
 C. Type of the variable is decided at run time
 D. None of them

... Answer is C)
Type of the variable is decided at run time

14. The process of Converting a Value Type to a Reference Type(object) is called ?

 A. Boxing
 B. UN-Boxing
 C. Conversion
 D. None of them

... Answer is A)
Boxing

15. File.AppendText() is used to create a StreamWriter ?

 A. Which appends UTF-16 encoded text to an new file
 B. Which appends UTF-8 encoded text to an existing file
 C. Cab be Both
 D. None of them

... Answer is B)
Appends UTF-8 encoded text to an existing file

16.  ?? operator In C# is called Null-coalescing operator which ? 

 A. Is used to check null values. 
 B. Is used to check any values.
 C. Both
 D. None of them

... Answer is A)
used to check null values

17.  In c# File.Move() method is used to move a specified file to a new location ? 

 A. True  
 B. False
 C. Can't say .
 D. None of them

... Answer is A)
True 

18. UInt32 is used to represents ?

 A. 64-bit unsigned integer
 B. 32-bit signed integer
 C. 32-bit unsigned integer  
 D. None of them

... Answer is C)
32-bit unsigned integer

19. In c# Anonymous type is created  ?

 A.Using the new keyword  
 B. It is a reference type data type
 C. Property, event and indexer cannot be an anonymous types.
 D. All of them

... Answer is D)
All of them
 

 

20. Enum is mainly used to assign the names or string values to integral constants which is a ? 

 A.Value Type 
 B. Reference Type  
 C. Both as per situation
 D. None of them

... Answer is A)
Value Type

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c# quiz part-1

 C# Quiz Part-1

1. Static constructor is used to initialize ?

 A. Non static data members
 B. Static data members
 C. Both
 D. None of them

... Answer is B)
Static data members

2. The members which is declared as private are available only ?

 A. With in the devired type Only
 B. With in containing type & devired type both
 C. With in the containing type only
 D. None of there

... Answer is C)
With in the containing type only

3. The members which is declared as Internal are available ?

 A. Any where within the containing assembly
 B. No where within the containing assembly
 C. Within the containing assembly & derived type
 D. None of them

... Answer is A)
Any where within the containing assembly

4. Default access modifier of class member is ?

 A. Protected Internal
 B. Public
 C. Internal
 D. Private

... Answer is D)
Private

5. Default constructor is classified into two types ?

 A. System-defined default constructor
 B. User-defined default constructor
 C. Both
 D. None of them

... Answer is C)
Both

6. Copy Constructor is used to ?

 A. Copy one array into another. 
 B. Copy one object data into another object.
 C. Both
 D. None of them

... Answer is B)
Copy one object data into another object 

7. Constants in c# are ? 

 A. Mutable 
 B. Immutable
 C. Changes their values.
 D. None of them

... Answer is B)
Immutable 

8. Read-only variable are required to initialize at its declaration ?

 A. True
 B. False
 C. Can't say 
 D. None of them

... Answer is A)
True 

9. In c# Array we can't insert value in the middle ?

 A. True 
 B. False
 C. Can't say
 D. None of them

... Answer is A)
True
 

 

10. ContainKey and ContainValue are two method of HashTable ?

 A. True 
 B. False 
 C. Both
 D. None of them

... Answer is A)
True 

Thank You

[dotnetfacts.com]

1000 C# Facts Part-2 : Access Modifiers

Access Modifiers define the accessibility of a class and its members in a program. It allow you to control access to the class and to restrict the class to be instantiated.

There are mainly 5 different access modifiers available in c#.

1. Private

2. Protected

3. Internal

4. Protected Internal

5. Public

#1. Public: The type (i.e class) or it's member can be accessed by any other code which is either present in the same assembly(dll)  or another assembly that references it. 

Public members are available any where without any restrictions.

   // Declaring employee id and name as public 

    public int employeeId; 

    public string employeeName; 

  

    // Constructor 

    public Student(int r, string name) 

    { 

        employeeId = id ; 

        employeeName = n; 

    } 

  

#2. Private: The members which is declared as private are available only with in the containing type.

   // Declaring employee id  as Private.

    private int employeeId; 

// employeeId will not be available in any other classes except current class.

#3. Protected: The members which is declared as protected are available with in the containing type(i.e same class) and  to the types (classes) that derive from the containing type.

class Color{ 

    // Member colorType declared as protected 

    protected int colorType ;

  

    public Color() 

    { 

        colorType = "red"; 

    } 

} 

  

// class Phone inherits the class Color

class Phone  : Color { 

  

    // Members of Phone class can access member of class 'Color' 

    public int getcolorType() 

    { 

        return colorType; 

    } 

} 

#4. Internal: The members which is declared as Internal are available any where within the containing assembly. 

Compile time error will through when we try to access, an internal member from outside the containing assembly.

#5. Protected Internal:  Protected Internal members can be accessed by any code in the assembly in which it is declared or from within a derived class in another assembly.

It is a combination of protected and internal. If you have understood protected and internal, this should be very easy to follow.

Key Facts About Access Modifiers : 

 >  Default access modifier of class is Internal. 

 >  Default access modifier of class member is private. 

 >  Access modifiers are not allowed on static constructors.

 >  Static keyword is used to access members of class before the object creation of that class.

 >  An object of a derived class cannot access the private member of the base class.

 >  The main()method is declared private by default if no other access specifier is used for it.

1000 C# Facts Part-1

Thank You