C# Class MCQs

Question 1: Which of the following is the default access modifier in a namespace?

Answer: C

Classes, records, and structs declared directly within a namespace can be either public or internal. internal is the default if no access modifier is specified. Members of the class and struct have private access by default.

Question 2: Which of the following is the default access modifier of the class members?

Answer: B

Classes, records, and structs declared directly within a namespace can be either public or internal. Internal is the default if no access modifier is specified. Members of the class and struct have private access by default.

Question 3: Which of the following keyword is used to reference two assemblies with the same fully qualified type names?

Answer: C

To reference two assemblies with the same fully-qualified type names, an alias must be specified at a command prompt, as follows:

/r:GridV1=grid.dll
/r:GridV2=grid20.dll

This creates the external aliases GridV1 and GridV2. To use these aliases from within a program, reference them by using the extern keyword. For example:

extern alias GridV1;
extern alias GridV2;

Visit extern alias keyword for more information.

Question 4: What is missing in the below class definition in order to successfully compile?

public Person
{
	public string Name{ get; set; }
}

Answer: B

Use the class keyword to define a class in C#.

Question 5: Which is the auto-implemented property in the below code snippet?

public class Person
{
	int Id = 0;
	public string Name{ get; set; }
      
	private int _age;
    
    public int Age
    {
        get { return _age; }
        set { _age = value; }
    }
}

Answer: B

Auto-implemented property is defined with {get; set;} that automatically assigns and return value. You don't need to implement simple getter and setter to assign and return value.