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Centrics Group  >  Career Center  >  Sample Interview Questions  >  C# .Net Interview Questions

C# .Net Interview Questions

C#.Net Interview Questions

Advanced C# .Net Questions and Answers

Question - Define assembly.
 
Answer - 
An assembly is the primary unit of a .NET application. It includes an assembly manifest that describes the assembly.

Question - What is Constructor?
 
Answer - 
It is the first method that are called on instantiation of a type. It provides way to set default values for data before the object is available for use. Performs other necessary functions before the object is available for use. 

Question - What is Destructor? 
Answer - It is called just before an object is destroyed. It can be used to run clean-up code. You can't control when a destructor is called since object clean up by common language runtime. 

Question - Define Abstract class in C#.NET.
Answer - Abstract class cannot be instantiated. 
Same concept in C++ known as pure virtual method. 
A class that must be inherited and have the methods over-ridden. 
A class without any implementation. 

Question - Explain serialization? 
Answer - 
Serialization is a process of converting an object into a stream of bytes. .Net has 2 serializers namely XMLSerializer and SOAP/BINARY Serializer. Serialization is maily used in the concept of .Net Remoting. 

Question - C#.Net support multiple inheritance, comment. 
Answer - No, but we can use interface instead.

Question - Can private virtual methods be overridden in C#.NET? 
Answer - No, moreover, you cannot access private methods in inherited classes, 
They have to be protected in the base class to allow any sort of access.

Question - Is is possible to force garbage collector to run?
Answer Yes, we can force garbage collector to run using System.GC.Collect(). 

Question - How do you inherit derived class from a base class in C#.NET? 
Answer - 
By using colon and then the name of the base class. 

Question - Name the Top .NET class that everything is derived from. 
Answer - System.Object. 

Question - Define protected class-level variable in C#.NET.
Answer - It can be inherited by the classes in the same namespace.

Question - Is it possible to inherit private class-level variables? 
Answer - No. 

Question - Is it possible to inherit multiple interfaces in C#.NET? 
Answer - Yes. 

Question - Define Protected internal. 
Answer - It is available to derived classes and classes within the same Assembly. 

Question - How to prevent your class from being inherited?
Answer - You can use keyword 'sealed' in the class definition to prevent class from being inherited. 

Question - List down difference between overriding and overloading.
Answer - 
When overriding, you change the method behavior for a derived class.
Overloading simply involves having a method with the same name within the class. 

Question - What does the keyword virtual mean in the method definition? 
Answer - The method can be over-ridden. 

Question - How to allow class to be inherited, but prevent the method from being over-ridden? 
Answer - You can do so by declaring the class public and making the method sealed. 

Question - When do we declare a class as abstract in C#.NET? 
Answer - When at least one of the methods in the class is abstract. 

Question - Define Interface class in C#.NET. 
Answer - It is an abstract class with public abstract methods with no implimentation 

Question - Difference between an interface and abstract class
Answer - In the interface all methods must be abstract; 
In the abstract class some methods can be concrete. 
In the interface no accessibility modifiers are allowed, which is possible in abstract classes. 

Question - How can you overload a method? 
Answer - Different parameter data types, different number of parameters, different order of parameters. 

Question - Difference between System.String and System.StringBuilder classes. 
Answer - System.String is immutable; 
System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed.

Question - Define Delegate. 
Answer - A delegate object encapsulates a reference to a method. 
In C++ they were referred to as function pointers. 

Question - How is DLL Hell problem solved in .NET? 
Answer - Assembly versioning helps to resolve not only the library it needs to run , but also the version of the assembly. 

Question - Ways to deploy an assembly. 
Answer - MSI installer, a CAB archive, and XCOPY command 

Question - Define Satellite Assembly. 
Answer - When you write a multilingual or multi-cultural application in .NET, and want to distribute the core application separately from the localized modules, the localized assemblies that modify the core application are called satellite assemblies. 

Question - Namespaces to create a localized application. 
Answer – System Globalization, System Resources. 

Question - List out difference between the Debug class and Trace class.
Answer - Use debug class for debug builds, use Trace class for both debug and release builds. 

Question - What are three test cases you should go through in unit testing?
Answer - Positive test cases (correct data, correct output), negative test cases (broken or missing data, proper handling), exception test cases (exceptions are thrown and caught properly).

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