Daily Interview Questions #15 : What is the difference between the C# keywords ‘ref’ and ‘out’?

ref	out
Parameters passed with the prefix “ref”. By using “ref” C# implements the concept called “Call by reference”.	Parameters passed with the prefix “out”.
An argument passed by ref must be assigned with a value before the call.	‘out’ parameter must assigned with some value prior to the termination of the function.

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Daily Interview Question #12 : What is the purpose of “sealed” keyword in C#?.

1. When you want to prevent an class from being inherited by another class, you should use “sealed” keyword in front of the class.

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Daily interview Question #10 : what is the purpose of "explicit" implementation of interface?

There are 2 purposes of explicit implementation of Interface:
First, it is used to avoid name collision between interface methods. That is if you are going to create a class library, there may be a chance to use the same name in several places. At that time "explicit" implementation comes as a rescue.
Secondly, You cannot access that implemented method through the object of the class directly. Instead you typecast it as Interface reference then you can access it. This is because, the C# complier, unable to determine which one the user want to call.

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Daily Interview Question #6: What are the different types of Constructor in C#?

Below is the list of Constructors available in C#:

1. Default Constructor

2. Parameterized constructor

3. Static Constructor.

 

By default constructor have “public” as access specifier. A class can have more than one Constructor. In C# “this” keyword is used to access the constructor from another constructor. By default, C# will provide a default constructor if no constructor declared.

 

Hope this helps!

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