Table of Contents[Hide][Show]
- 1. What exactly is C#?
- 2. What distinguishes C# from C?
- 3. What exactly is a class?
- 4. What exactly is an object?
- 5. What is the distinction between the terms static, public, and void?
- 6. Define Constructors.
- 7. What is C# in garbage collection?
- 8. What exactly does structure mean in C#?
- 9. How does C# code get compiled?
- 10. Clearly describe the different C# classes.
- 11. What exactly are Jagged Arrays?
- 12. What is the distinction between the out and ref parameters?
- 13. In C#, what is a destructor?
- 14. In C#, what is an indexer?
- 15. What is the difference between managed and unmanaged code?
- 16. Describe serialization.
- 17. In C#, how do fields and properties vary from one another?
- 18. How can you describe using statements in C# in detail?
- 19. How would you implement numerous interfaces with the same method name in the same class?
- 20. In C#, what is the distinction between Task and Thread?
- 21. What is the finalize function in C#?
- 22. Make a distinction between finalize blocks and finalize.
- 23. Describe the C# dispose of method in detail.
- 24. What is C# Method Overloading? Elucidate.
- 25. What is the distinction between read-only and constants?
- 26. What are User Control and Custom Control?
- 27. In C#, what is a multicast delegate?
- 28. What exactly is object pooling in C#?
- 29. What exactly are generics in C#.NET?
- 30. Is it feasible to override a private virtual method?
- 31. Differentiate between method overloading and method overriding in C#?
- 32. In C#, what is the distinction between String and StringBuilder?
- 33. What exactly are delegates?
- 34. When should you utilize multithreading in C# and when should you avoid it?
- 35. In C#, what is a multicast delegate?
- 36. In C#, what is the distinction between late binding and early binding?
- 37. Differentiate between Directcast and Ctype?
- 38. How is HashSet utilized in C#?
- 39. Please explain Thread Pooling in C#.
- 40. What is the distinction between the Const and ReadOnly keywords in C#?
- 41. What details regarding the C# XSD file can you provide?
- 42. What do Get and Set Accessor properties mean to you?
- 43. What exactly is dependency injection in C#?
C# (formerly known as C sharp) is an object-oriented programming language that is frequently used by developers to do several activities and achieve multiple goals.
Object-oriented programming languages, such as C++, Python, and Java, come in a variety of flavors. These programming languages are designed to function inside a certain framework. Similarly, C# is created and developed for a specific framework, namely, NET.
The .NET framework was created by Microsoft. It provides a vast platform for developing applications, declarations, application instructions, and so on. C# can be used for web development, gaming, mobile apps, windows applications, and other similar projects.
With such advantages, the use of C# has expanded, and the need for specialists who can utilize it accurately has climbed doubled. Because C# is such a popular programming language, a multitude of large and small firms base their products on it.
So, practice basic and advanced level C# questions to ace the interviews.
1. What exactly is C#?
Microsoft C# is a contemporary, general-purpose, object-oriented programming language. C# is intended for the Common Language Infrastructure (CLI), which comprises executable code and a runtime environment that enables the usage of numerous high-level languages on diverse computer systems and architectures.
2. What distinguishes C# from C?
C is usually known as the procedural language, whereas C# is more object-oriented. The main distinction is that C# allows automated garbage collection via the Common Language Runtime (CLR), whereas C does not. C# requires the.NET framework to run, whereas C is a platform-independent language.
3. What exactly is a class?
A class serves as a template for building objects. Along with techniques, it has attributes. From a single class, we can produce several instances of an object.
4. What exactly is an object?
A class instance known as an object is how we access a class’s functionalities. To construct an object, we can use the “new” keyword. The functions, data members, and behavior of a class that produces an object in memory are stored.
5. What is the distinction between the terms static, public, and void?
Anywhere in the program can access publicly defined variables. Static variables can be accessed globally without the requirement to build a class instance. In C#, a type modifier called Void is used to indicate the return type of a method.
6. Define Constructors.
A constructor is a class-specific member function. When an object is formed, the constructor is called automatically. The class constructs all the values of data members as it is initialized.
7. What is C# in garbage collection?
The process of cleaning up memory that has been occupied by undesired items is known as garbage collection. A certain amount of memory is automatically assigned to a class object when it is created in the heap memory. Now that you’ve finished working on the item, the memory space it formerly occupied is wasted. Memory has to be freed up.
8. What exactly does structure mean in C#?
In C#, a structure is a data type that is made up of numerous data types, such as methods, fields, constructors, constants, properties, indexers, operators, and even other structures. A structure aids in the consolidation of many data kinds into a single unit. In this manner, they are analogous to courses. Structures are value types, whereas classes are reference types.
9. How does C# code get compiled?
When a project is created, the C# source code is compiled into Intermediate Language (IL). IL is a collection of instructions that generates machine code for execution on a machine processor. Code is sent from the preprocessor to the compiler, then to the assembler, and finally to the linker in four stages.
10. Clearly describe the different C# classes.
- Static: It is the kind of class that cannot be instantiated, therefore we cannot use the new keyword to make an object of it, but we can call the members of the class directly by using their class name.
- Abstract: To define abstract classes, use the abstract keyword. No objects can be created for abstract classes. It has to be inherited in a subclass if you want to use it. Simple definitions of abstract and non-abstract methods are allowed within an Abstract class.
- Partial: This class enables you to separate your properties, methods, and events into several source files, which are subsequently combined into a single class at build time.
- Sealed: A sealed class cannot be inherited from another class and has limited characteristics. Access modifiers cannot be added to the sealed class.
11. What exactly are Jagged Arrays?
An array with array elements is referred to as a jagged array. Elements of Jagged Arrays could be of many shapes and sizes.
12. What is the distinction between the out and ref parameters?
When giving an argument as a ref, the parameter must be initialized before being passed to the method. An out parameter, on the other hand, does not need to be initialized before being supplied to a method.
13. In C#, what is a destructor?
A destructor is a type of method in C# that is part of a class. A destructor’s primary function is to delete instances of a class when they are no longer required in order to free up memory. Destructors are sometimes known as finalizers.
14. In C#, what is an indexer?
Indexers are used in C# to find instances of a class or structure. The indexed values can therefore be accessed similarly to an array, but without having to explicitly declare a type or instance member.
15. What is the difference between managed and unmanaged code?
Managed code allows you to run code in the.NET framework on a managed CLR runtime environment.
Controlled code executes on the managed runtime environment rather than the operating system. Provides a variety of services such as a trash collector, exception handling, and so on.
Unmanaged code is code that does not execute on the CLR and operates outside of the.NET framework. They do not supply high-level language services and hence operate without them. C++ is one such example.
16. Describe serialization.
A stream of bytes must be created from the item in order to transfer it over a network. Serialization is the act of transforming an item into a stream of bytes. The Serialize Interface must be implemented for an item to be serializable. The opposite of constructing an object from a stream of bytes is called de-serialization.
17. In C#, how do fields and properties vary from one another?
A field is a class member or an object of any kind that serves as a location for storing data, whereas a property is a class member that offers a method for reading, writing, and computing the value of a private field.
18. How can you describe using statements in C# in detail?
The using statement is used to restrict the use of one or more resources within the application. The resources are consumed and released on a constant basis.
This statement’s primary job is to manage unwanted resources and automatically release them. Once the object that is utilizing the resource is formed, make sure that the object’s dispose function is called to release the resources required by that object; here is where using statements comes in handy.
19. How would you implement numerous interfaces with the same method name in the same class?
To implement several interfaces with the same method name, avoid implementing them within the body of the function. Instead, you would supply the name of the interface directly in the method body. The compiler will recognize which interface methods are being referenced, addressing the problem.
20. In C#, what is the distinction between Task and Thread?
A thread is a real Operating System thread with its own stack and kernel resources. Thread provides the most control. The thread allows you to Abort (), Suspend (), or Resume (). A Thread’s status can be observed or its attributes, such as stack size, apartment state, and culture, can be set. The CLR keeps a pool of threads wrapped by ThreadPool.
The Task Parallel Library has a class called Task. Unlike the ThreadPool, the Task does not have its own Operating System thread. Tasks are executed by the TaskScheduler, although the default scheduler is executed by the ThreadPool. It is possible to be notified when a Task completes and to obtain a result.
21. What is the finalize function in C#?
The object class that is used for cleaning actions defines the finalize () function. When a reference to an object is not utilized over an extended period of time, the garbage collector will often call this function.
The garbage collector automatically frees controlled resources, but if you wish to free unneeded resources like file handles, data connections, and so on, you must explicitly implement the finalize function.
22. Make a distinction between finalize blocks and finalize.
The finished block is called after the try-and-catch blocks have been completed since it is needed for exception handling. The block of code is executed regardless of whether the exception was caught. The block’s code is generally cleaner.
The finalize method is invoked just before garbage collection. The finalized method’s major responsibilities are to clear up unmanaged code, which is automatically triggered anytime an instance is not re-called.
23. Describe the C# dispose of method in detail.
The disposeof() function frees an object’s unused resources. Unused resources, such as files, data connections, and so forth. This function is specified in the interface IDisposable, which is implemented by the class by declaring the interface IDisposable body.
The dispose function is not called automatically; the programmer must implement it manually for effective resource utilization.
24. What is C# Method Overloading? Elucidate.
Method overloading is a typical approach in C# that is used to construct a number of methods with the same name and specified signatures. This procedure is repeated with the same class.
When the method overloading procedure is complete, the compiler commences operations to call specified actions based on the method overloading.
25. What is the distinction between read-only and constants?
Constant variables are declared and initialized during compilation. After then, this value cannot be altered. On the other hand, read-only is used once a value has been allocated at run time.
26. What are User Control and Custom Control?
Compiled code is used to develop custom controls. These may be included in the toolbox and are easy to use. By dragging and dropping these controls, developers may include them in their web forms.
User controls and ASP-included files are quite similar. They’re also simple to make. User controls, on the other hand, cannot be added to the toolbox. They also cannot be pulled and dropped from it.
27. In C#, what is a multicast delegate?
A multicast delegate maintains references or addresses to several functions at the same time. When we invoke the multicast delegate, it will also invoke all of the other functions to which it is referring. To call several methods, use the whole method signature, just like the delegate. As an example:
28. What exactly is object pooling in C#?
Object pooling is a design technique in software that recycles things rather than rebuilding them. It accomplishes this by storing chosen items in a pool and making them available for usage when an application requests them. This procedure improves performance by reducing needless object generation.
29. What exactly are generics in C#.NET?
Generics are used to create reusable code classes in order to reduce code redundancy, improve type safety, and improve speed. We can construct collection classes with generics.
In the System, a generic namespace should be utilized instead of classes like ArrayList. Namespace for collections. The use of parameterized types is encouraged by generics.
30. Is it feasible to override a private virtual method?
A private virtual method cannot be overridden since it is private to the class and cannot be accessed from outside of it.
31. Differentiate between method overloading and method overriding in C#?
Method overriding is the process of altering a derived class’s fundamental definition. The methods of the derived class eventually behave differently as a result of this strategy.
Method overloading, on the other hand, can be described as the act of generating many methods with the same name but distinct signatures under the same class.
32. In C#, what is the distinction between String and StringBuilder?
A string object is immutable, which means it cannot be altered once it has been created. Any attempt to change the string object will result in the creation of a new string object.
A string builder object, on the other hand, is malleable and can be altered as the developer sees appropriate.
33. What exactly are delegates?
In C++, delegates are fundamentally the same as function pointers. The sole distinction between the two is that delegates are type-safe whereas function pointers are not. Delegates are necessary because they enable the construction of generic type-safe functions.
34. When should you utilize multithreading in C# and when should you avoid it?
Multithreading, often known as threading, is an effective approach to increase the speed of a program in which numerous activities execute concurrently. It enables various threads to execute independently, rather than waiting for the preceding step to be completed. This has the ability to increase the pace of a program.
However, when several of the program’s processes are interconnected, multithreading is not recommended. For example, if Step B was dependent on Step A being completed first, multithreading would cause performance concerns and software flaws. Threading gets increasingly sensitive as a program develops in complexity.
35. In C#, what is a multicast delegate?
A multicast delegate in C#, as opposed to a basic delegate, refers to numerous target methods. When a multicast delegate is utilized, all of the functions pointed to by the delegate are called. They are implemented with the help of the system’s MulticastDelegate class.
36. In C#, what is the distinction between late binding and early binding?
- Early binding takes place at compile time, whereas late binding takes place during runtime.
- Late binding is often slower than early binding since it occurs at runtime.
- In contrast to late binding, which uses the object to resolve method calls, early binding resolves method calls using class information.
37. Differentiate between Directcast and Ctype?
The kind of object that requires the run-time type to match the specified type in DirectCast is converted using DirectCast.
When a conversion is specified between an expression and a type, Ctype is utilized.
38. How is HashSet utilized in C#?
In C#, a HashSet is an unordered collection of distinct values. In general, it is used to prevent duplicate elements from being inserted in a collection, and it performs better than a list at this task.
The HashSet class, which is descended from the System, is used to implement it.
39. Please explain Thread Pooling in C#.
In C#, a thread pool is a collection of threads. These threads are employed to do tasks without interfering with the primary thread’s functionality. A thread in a thread pool returns to the thread pool when it has finished running.
The System class contains classes that handle the thread in the thread pool and its actions. Threading. ThreadPool is a namespace.
40. What is the distinction between the Const and ReadOnly keywords in C#?
- ReadOnly cannot be declared within the method, while Const can.
- Const is a compile-time constant, whereas ReadOnly is a runtime constant.
- ReadOnly values can be altered, but Const values cannot.
41. What details regarding the C# XSD file can you provide?
XSD stands for XML Schema Definition. If no XSD file is connected with the XML file, it can have any attributes, elements, and tags. The XSD file provides a framework for the XML file, determining what components and attributes should be present in the XML file as well as their order.
42. What do Get and Set Accessor properties mean to you?
In C#, Get and Set have termed accessors since they are made using properties. A property allows reading and writing to a private field’s value. Such private fields are accessed via accessors.
While the Get property is used to return the value of a property, the Set property is used to set the value.
43. What exactly is dependency injection in C#?
Dependency injection (DI) is a design technique in C# that is used to create loosely linked programming. This procedure transfers the creation and binding of dependent objects outside of the class on which they rely. The major goal is to make future code modifications more manageable.
C# is the primary programming language that is used in all higher-level programming languages. C# developers are in great demand and can find attractive career prospects in industries such as front-end development, back-end programming, and app development. And because Microsoft supports it, C# popularity will only grow.
The aforementioned are the most crucial C# interview questions for experienced professionals and beginners. See Hashdork’s Interview Series for help with interview preparation.