.NET interview questions :- What is the use of private constructor ?

.NET interview questions :- What is the use of private constructor ?

Answer:This is one of those .NET interview question which is asked from the perspective to test if you understand the importance of private constructors in a class.When we declare a class constructor as private , we can not do 2 things:-

  • We can not create a object of the class.
  • We can not inherit the class.

Now the next question which the interviewer will ask , whats the use of such kind of class which can not be inherited neither instantiated.

Many times we do not want to create instances of certain classes like utility , common routine classes. Rather than calling as shown below

clsCommon common = new clsCommon();
common.CheckDate("1/1/2011");

You would like to call it as

clsCommon.CheckDate("1/1/2011");

Check my 21 important Most asked Dotnet interview questions

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