C Sharp .net Interview Questions And Answers Pdf

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Top C# Interview Questions and Answers

Debuting back in , C has succeeded in becoming one of the leading programming languages. As a multi-paradigm programming language, C also has some features of functional programming that takes its usefulness and versatility to a step further. In the following section, we have enlisted the most important C interview questions. These questions prepare you for your next C interview in addition to enhancing your C knowledge and letting you evaluate your current C understanding.

Answer: C is an object-oriented programming language that was developed by Microsoft in It is supported by different operating systems. C is the primary language that is used to create. Net software applications. It allows us to create Windows UI apps, backend services, controls, libraries, android apps, and even blockchain applications. C works on the concept of classes and objects just like Java.

Answer: C is an object-oriented language and classes are its foundation. A class generally depicts the structure of data, how data is stored and managed within a program. A class has its own properties, methods, and other objects that define the class. Objects are the real-world entity having some characteristics and is created using the class instance.

These classes define the type of the defined object. For example, if we consider a program that covers the object related to the book. We call the class a Book which has two properties: name and the author. In real programming, Vedas is an object and an instance of the class Book. Answer: These are the keywords that help to define the accessibility of class, member, and data type in the program. These keywords are used to restrict the use of some data manipulation done by other classes.

There are 4 types of access modifiers- public, private, protected, and internal. These modifiers define 6 other accessibility levels when working together- public, protected, internal, protected internal, private, and private protected. Answer: It takes 4 steps to get a code to get compiled in C. Below are the steps:. The resources are continuously consumed and released. The main function of this statement is to manage unused resources and release them automatically.

The unused resources like files, data connections, etc. This method is declared in the interface called IDisposable which is implemented by the class by defining the interface IDisposable body.

Dispose method is not called automatically, the programmer has to implement it manually for the efficient usage of the resources. Answer: Finalize method - The finalize method is defined in the object class which is used for cleanup activities. This method is generally called by the garbage collector whenever the reference of any object is not used for a long time. Garbage collector frees that managed resources automatically but if you want to free the unused resources like filehandle, data connection, etc.

Answer: An exception is a raised problem that may occur during the execution of the program. Handling exceptions offers a simple way to pass the control within the program whenever an exception is raised. C exceptions are handled by using 4 keywords and those are try, catch, finally, throw. Unlike constructors, destructors mainly delete the object. The destructor name must match exactly with the class name just like a constructor. Answer: Method overloading allows programmers to use multiple methods but with the same name.

Every defined method within a program can be differentiated on the basis of the number and the type of method arguments. It is a concept based on polymorphism.

Answer: You can control the flow of your set of instructions by using control statements and we majorly focus on if statements. There are a few types of if statements that we consider for making situations to control the flow of execution within a program. If statements checks for the user given condition to satisfy their programming condition.

If it returns true then the set of instructions will be executed. If-else statement checks for the given condition, if the condition turns out to be false then the flow will transfer to the else statement and it will execute the else instructions.

In case, the if condition turns out to be true then the if instructions will get executed. Nested if statement checks for the condition, if the condition is true then it will check for the inner if statement and keeps going on for the last if statement. If any of the conditions are true then it will execute the particular if instructions and stops the if loop there. If else-if checks for the given condition, if the condition is not true then the control will go to the next else condition, if that condition is not true it will keep on checking for next else conditions.

If any of the conditions did not pass then the last else instructions will get executed. Boxing - is a process of converting a value type to an object type where value type is placed on the stack memory, and the object type is placed in the heap memory.

This conversion is an implicit conversion and you can directly assign any value to an object, and C will handle the rest of the conversion on its own. Unboxing - it is the reverse process of the boxing process. It is a conversion of the object type to the value type and the value of the boxed object type placed on the heap memory which will be transferred to the value type which is placed on the stack.

This conversion of the unboxing process has to be done explicitly. In this case, any changes that are made into the formal parameter of the function will be having no effect on the actual value of the argument.

Reference Parameters: with this method, you can copy the argument that refers to the memory location into the formal parameter that means any changes made to the parameter affect the argument.

Answer: A multicast delegate holds the references or addresses to more than one function at a single time. Whenever we invoke the multicast delegate, it will invoke all the other functions that are being referred by that multicast delegate. You should use the complete method signature the same as the delegate to call multiple methods. For example:. Here, we created an instance of the Rectangle class and then called the two different methods.

Now a single delegate will invoke these two methods Area and Perimeter. These defined methods are having the same signature as the defined delegates that hold the reference to these methods.

Answer: In C , you cannot put a null value directly into any variable and the compiler does not support it. So, the revised version C 2. You cannot make the nullable types to work with value types.

Nullable value can only work with the reference types as it already has a null value. This T contains a non-nullable value type that can be any data type you want.

There is no possibility that you can access the value of the nullable value type directly with assigning the value. For getting its original assigned value you have to use the method GetValueOrDefault. If the value is null then it will provide zero as it is its default value.

The memory allocated for the value type content or assigned value is stored on the stack. When we create any variable, space is allocated to that variable and then a value can be assigned to that variable. Also if we want to copy the value of that variable to another variable, its value gets copied and that creates two different variables.

It holds the reference to the address of the object but not the object directly. Reference types represent the address of the variable and assigning a reference variable to another does not copy the data but it creates a second copy of the reference which represents the same location on the heap as the original value. Reference values are stored on the heap and when the reference variable is no longer required it gets marked for garbage collection.

Answer: In C , there is a special method that is invoked automatically at the time of object creation. It initializes the data members of a new object and has the same name as the class or the structure. There are two types of constructors:. Answer: Collection classes are classes that are mainly used for data storage and retrieval. These collection classes will serve many purposes like allocating dynamic memory during run time and you can even access the items of the collection using the index value that makes the search easier and faster.

These collection classes belong to the object class. You can use it as an alternative to the array. Using index you can easily add or remove the items off the list and it will resize itself automatically. It works well for dynamic memory allocation, adding or searching items in the list. Hash table: if you want to access the item of the hash table then you can use the key-value to refer to the original assigned value to the variable.

Whenever you add an item to the list it is called pushing and when you remove the item off the list it is called popping. Queue: this collection works on the concept of first-in and first-out collection of the object. Adding an item to the list is call enqueue and removing the item off the list is call deque. You can use this collection class when you do not know the number and the items can be accessed by using integer indexes that start from zero.

Answer: Whenever you open a file for reading or writing it becomes a stream which is a sequence of bytes travelling from source to destination. The two commonly used streams are input and output. The included namespace is system. IO that includes many classes for file handling. The stream is an abstract class that is the parent class for the file handling process. The file is a static class with many static methods to handle file operation.

Answer: An interface class is completely an abstract class that contains abstract methods and properties.

Top 50 C# Interview Questions and Answers for 2021

Home Categories. Need Help? Our Support Team is here to help. Ask Question. Here Mudassar Ahmed Khan has covered the list of best possible C Interview Questions and Answers of the C programming language and explain in as simple language as possible so it becomes understandable by every fellow programmer. C is an enormous programming language with many concepts which is being constantly updated by Microsoft and hence the list of C Interview Questions and Answers cannot be constant. Thus this article and the downloadable PDF file will be periodically updated with the new questions that fit best into this list of C Interview Questions and Answers.

Top 50 C# Interview Questions You Need To Know In 2021

Dear readers, these C Interview Questions have been designed specially to get you acquainted with the nature of questions you may encounter during your interview for the subject of C. C is a modern, general-purpose, object-oriented programming language developed by Microsoft. C is designed for Common Language Infrastructure CLI , which consists of the executable code and runtime environment that allows use of various high-level languages on different computer platforms and architectures.

Most Asked C# Interview Questions

Job Interview Questions & Answers

What are the fundamental principles of OO programming? Answer: As a developer, you might be tempted to answer that it comprises things like Encapsulation, Polymorphism, Abstraction, and Inheritance. Principles are crucial but they are not the most important aspect of what OO actually is. What is really important is to understand in what grounds OO is built upon, or in other words, what are the foundations of OO programming. The two most fundamental core concepts on which OO has been built upon in C are this pointer and Dynamic Dispatch. Obviously, there are principles like Encapsulation, Polymorphism, Abstraction, and Inheritance, but these are the consequence and not the generating force behind the OO paradigm in C. Explain Partial Class in C?

Debuting back in , C has succeeded in becoming one of the leading programming languages. As a multi-paradigm programming language, C also has some features of functional programming that takes its usefulness and versatility to a step further. In the following section, we have enlisted the most important C interview questions.

Although both variables are uninitialized, String is a reference type and DateTime is a value type. Is the comparison of time and null in the if statement below valid or not? Why or why not? One might think that, since a DateTime variable can never be null it is automatically initialized to Jan 1, , the compiler would complain when a DateTime variable is compared to null.

C is fully object oriented programming language to develop dynamic web applications in.

This is a list of the top 50 C interview questions and answers for C developers who plan to attend C and. NET interviews. Here are top 50 C interview questions and answers. These C interview questions are for both beginners and professional C developers. What is C?

C is a general purpose programming language which encompasses various disciplines like object-oriented programming, static typing, component-oriented programming, strong typing, etc.


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