Top 7 C# Interview Questions and Answers

  • How can you define console applications?

A control application is a special application which can be operated through the command prompt in Windows. The following is meant for any beginner on .Net. The following can be used to create a console application in the very first step to start with. The work of the console application is to take input and display output at a command line console with access to three general streams namely standard output, standard input and standard error. The following also provides a simple user interface for applications which require very less or no user interference. Individuals have to follow certain steps which can help them to build a console application.

  • How can you distinguish between directcast and ctype?

Directcast can be used to convert the nature or type of object which needs proper run-time type to be similar like the particular type in DirectCast. On the other hand, Ctype is used for converting where the conversion is defined between the expression as well as the type. Directcast is used to cast reference types whereas the use of Ctype is to cast value types. In case of Ctype, expectations are not provided while making use of Ctype. On the other hand, in case of DirectCast, InvalidCastException is thrown if arguments don’t match.

  • What do you know about the attributes of C# and why is it important?

C# gives the developers another way to define declarative tags on particular entitles. The following include method, class and many more. These are known as attributes of C#. The information of the attributes can be retrieved at the time of operation by making use of reflection. C# basically gives a mechanism for declarative tags which are known as attributes. The following is used to convey certain declarative data or metadata regarding different code elements like assemblies, methods, types, properties and many more. They are added to the code by making use of a declarative tag.

  • How can you distinguish between “throw” and “throw ex” in .Net?

“Throw” statement preserves the real errors on the error stack whereas “throw ex” has the stack trace from the throw point. Individuals are generally recommended to make use of “throw” because the following gives more proper error information. The work of “throw” is to reset the stack trace which can help the users to get line number of error by making use of throw users can get all the exception information. The work of throw ex is to reset the stack trace.

  • What do you know about indexers in C# .NET?

Indexes are otherwise known as smart arrays in C#. The individuals going for the interview are required to know everything about indexers before going for the interview. The following lets the instances of the class to be indexed in the same way just like in an array. The following is actually a class property in C# which allows the users to gain access to a member variable of a class or a struct by making use of certain features in an array. The indexers present in C# are applicable for both structs as well as classes.

  • What do you know about multicast delegates?

multicast delegate is actually a delegate which features numerous handlers which are assigned to the following. The following is one of the most crucial elements of C#. Each handler is designed in a special way and is assigned to a certain method. The following is a special kind of delegate whose work is to hold the references of one or more than one function. When the following is invoked, then all the functions which are referenced by the delegate are generally going to be invoked. 

  • How can you differentiate between “as” operators and “is” operators in C#?

The work of the “is” operator is to check whether the operation time of a particular object is compatible with the type provided or not. On the other hand, the work of the “as” operator is to perform conversion between nullable reference types or compatible reference types. The as operator is not of Boolean form but the “is” operator is of Boolean type. The “is” operator returns true if the object provided is of similar type. On the other hand, the “as” operator at the same time returns the object when it is compatible with the type provided.

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