Introduction A callback is a function that will be called when a process is done executing a specific task. i.e. if a process is going on and in between it targets if some specific task complete then it returns to the main method. In computer programming, a callback is an executable code that is passed as an argument to other code. Wiki Simple example of … Continue reading Callback in C#
Introduction In C#, the structure is a user-defined data type which represents a data structure. We can also say that structure is a collection of different data types encapsulated into a single unit similar to a class. It is created or used for representing small objects. In C# Structure is a value type so when we create an object of structure type, object instance will … Continue reading Structure in C#
Below are the Abstract Class Interview Questions for beginners and experienced developers for Interview Preparation. What is the need for abstract classes? Abstract classes allow partial implementations of a methods in a class Which is mostly used for an extension the sub class. Where parent class has default implementation and class specific implementation can be done in the child class. Abstract class promotes code reusability … Continue reading Abstract Class Interview Questions
Below are the interface interview questions in C# for beginners and experienced developers What is the use of interface? Interface mostly used for following reasons: Specifying contract Multiple inheritances Loosely coupled code Specifying contract – Interface is used to define a contract in the application, so that the other application should follow the contract in order to execution. In other words, we can say that … Continue reading Interface Interview Question in C#
Below is the list of Polymorphism Interview Questions for interview preparations for beginners and experience professional What is Polymorphism in C#? Polymorphism is one of the main pillars of object-oriented programming (OOP), it allows the programmer to change the object behavior based on object creation or way the is being called. It also provides the facility to inject different features to the existing functionality or … Continue reading Polymorphism Interview Questions
Why multiple inheritance is not supported in C#? To avoid ambiguity and Diamond problem, Consider a scenario where A, B, C and D are four classes. If B and C class is derived from A class, now if class D is derived from Class B and Class C using Multiple inheritance, now if class D wants to call common method which is implemented in Class … Continue reading Inheritance Interview Questions
What is inheritance? Inheritance is the process of deriving quality from the parent. In object-oriented programming (OOP), it is the process of creating a class from another class called a base class. So that derived class(child class) can acquire the property, methods of a base class. Derive (a quality, characteristic, or predisposition) genetically from one’s parents or ancestors. We can say that inheritance would be … Continue reading Inheritance
Why we need a constructor in object-oriented programming? The purpose of Constructor is to initialize the values of data members or to perform some logic when an instance of the class gets created. Yes, we can achieve this without constructor but for that, we need to make explicit calls and chances that someone might forget to call method to initialize the values before creating an … Continue reading Constructors Interview Questions
Collection of typically Interview Questions on lambda expression for interview preparation. you can also read more about Lambda expression Alternatively, you can also test your knowledge by an online free quiz for a lambda expression. Interview Question: What is Lambda expression? Answer: Lambda Expressions are nameless functions given as constant values. They can appear anywhere that any other constant may, but are typically written as a … Continue reading Lambda Expressions – Interview Question
Introduction In the earlier post, we talk about anonymous methods, we had seen that by using anonymous methods, we can define a method without providing a name to the method, in addition to it, we were also not required to specify the access specifier and the return type of the method. Lambda expressions are a further shortcut to writing anonymous methods. To understand more let’s … Continue reading Lambda Expressions
Collection of typically Interview Questions on anonymous methods for interview preparation. you can also read more about anonymous methods. Alternatively, you can also test your knowledge by an online free quiz for anonymous methods. Interview Question: What is Anonymous method? Answer: Anonymous methods were introduced into C# 2 as a way of creating delegate instances without having to write a separate method. They can capture local … Continue reading C# Anonymous methods Interview Question
Introduction An anonymous method is a method without a name, which is used as a parameter for the delegate. As we know that an instance of a delegate is created by explicitly initializing it with a method that was defined elsewhere. To further this, there is a concept of anonymous methods through which we can write an unnamed block of code that can be executed … Continue reading Anonymous Methods
Collection of typically Interview Questions on generic delegates for interview preparation. you can also read more about delegates, callbacks, Multicast Delegates, Generic Delegates. Alternatively, you can also test your knowledge by an online free quiz for delegates, multicast delegate, generic delegates. Interview Question: What are Generic Delegates in C#? Answer: The Func , Action and Predicate are the three generic delegates. We can make use of all these three predefined … Continue reading Generic Delegates (Action, Func, Predicate) – Interview Questions
Introduction In an earlier post, we have discussed delegates, multicast delegate. In this article, I am going to discuss the Generic Delegates in C#. In .NET Framework 3.5, C# introduces Generic delegate which allows to invoke the delegates without defining the delegate instance. To understand the Generic Delegates, we should have the basic knowledge of Delegates. I would recommend checking earlier posts related to delegates, … Continue reading Func, Action & Predicate – Generic Delegates
Collection of typically Interview Questions on delegates for interview preparation. you can also read more about delegates, callbacks, and Multicast Delegates. Alternatively, you can also test your knowledge by an online free quiz for delegates and multicast delegate. Interview question: What is a delegate? Answer: A delegate is a type-safe function pointer. Using delegates you can pass methods as parameters. To pass a method as … Continue reading Delegates Interview Questions
Collection of typically Interview Questions on Multicast delegates for interview preparation. you can also read more about delegates, callbacks, Multicast Delegates, Generic Delegates. Alternatively, you can also test your knowledge by an online free quiz for delegates, multicast delegate, generic delegates. Interview Question: What is Multicast delegate/ chaining delegates? Answer: The capability of calling multiple methods on a single event is called as Multicast delegate or chaining delegates, Multicast delegates can be … Continue reading Multicast Delegates Interview Questions
Introduction In earlier post we have discussed about the Delegates, a delegate holds the reference of a method. As the name suggests, a Multicast delegate is a delegate that holds the reference of more than one method. The only requisite is that all such methods should have the same signature, i.e. the same return type and the same number and type of parameters. When we … Continue reading Multicast Delegates
Introduction When a head of state dies, the President of the United States typically does not have time to attend the funeral personally. Instead, he dispatches a delegate. Often this delegate is the Vice President, but sometimes the VP is unavailable, and the President must send someone else, such as the Secretary of State or even the First Lady. He does not want to “hardwire” … Continue reading Delegates
Introduction Extension Methods allow user to add additional feature or methods to existing class without creating a new derived type. Before diving into extension method, lets understand why we use extension method in c#? Example Suppose that there is a class with n number of methods, and you want to add more methods into it. you can add Extension methods using below two approach: You … Continue reading Extension Methods
Introduction In the previous post, we have covered basics of exception handling, the purpose of exception handling, types of error, list of system exceptions, and some examples of run time error. In this post will cover ways to handle the exceptions in C#, multiple exceptions catches and writing custom exceptions below is the index: How to handle Exception in C# C# provides built-in support to … Continue reading Exception Handling in C# – Part II
Introduction In C#, You can use more than one catch block with the try block to handle different types of exceptions means each catch block is used to handle different types of exceptions. For example: Below example, we have added multiple catch block, so let say if the user has entered string value in first input then control will be passed to the FormatException catch … Continue reading Interview Questions: Multiple Catch Block in C#
Introduction Exception handling is handling known or unknown errors from the program. So, when any error occurs then the program should recover gracefully from the error. In computing and computer programming, exception handling is the process of responding to the occurrence of exceptions – anomalous or exceptional conditions requiring special processing – during the execution of a program. Wiki The basic purpose of exception handling … Continue reading Exception Handling in C# – Part I
Introduction Thread.Sleep allows user to hold or suspend or block the current thread execution till a predefined time. it is implemented in System.Threading.Thread.dll assembly. It has two overload method C# Source code to demonstrate thread sleep Why you should avoid Thread.Sleep Thread.Sleep required hardcoded sleep time value, which is not a good idea at all. In multithread applications, handling a race condition using Thread.Sleep is … Continue reading Why you should avoid Thread.Sleep
In earlier post we have seen how value type and reference type variable instances behave differently when create copied variable and changing copied variable values. Pass by value Pass by value means you are making a copy in memory of the actual parameter’s value that is passed in, a copy of the contents of the actual parameter. Use pass by value when you are only … Continue reading Passing by Value vs. Passing by Reference
For any program, Variables are required to either hold the data, store the data or to accept the data. In .NET, Variables are declared using types. .NET uses the Common Type System (CTS) to define data types. In .NET, these types are categorized based on how values stores into the memory. There are two types in .Net i.e. value types and reference types. Instances of … Continue reading Types in .Net
