C# reflection, interfaces, abstract class, generics, ref vs out, C# versions 4,5,6 and features.

Top LINQ Interview Questions and Answers - Part 2

Question 11. What is the use of into keyword in LINQ? 'into' keyword lets us save the intermediate result into a variable. We can further write LINQ query against this variable. static string[] names = { "Kapil Malhotra", "Michael Jackson", "Miami Sinha" }; static void Main(string[] args) { var result = from name in names ...

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Top LINQ Interview Questions and Answers - Part 1

Question 1. What is LINQ? LINQ stands for Language INtegrated Query. LINQ allows us to write queries over local collection objects and remote data sources like SQL, XML documents etc. We can write LINQ query on any collection class which implements the IEnumerable interface. Question 2. What is Sequence and Query Operators in LINQ? Sequence is a collection class on ...

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Top 10 C# / .NET OOPS Interview Questions and Answers

Question 1. What is Object Oriented Programming (OOPS)? OOPS is a technique to develop modules. These modules are assembled together as software. OOPS works on the objects. Everything in OOPS is object. Object is made up of states and behaviors. Objects communicate with each other by sending messages to each other. Object hierarchy are built using Aggregation and Composit...

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C# Barrier

C# Barrier class is synchronization primitives used in .NET threading. Barrier is used in an algorithm which composed of multiple phases.  In this Barrier synchronization, we have multiple threads working on a single algorithm. Algorithm works in phases. All threads must complete phase 1 then they can continue to phase 2. Until all the threads do not complete the p...

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C# CountdownEvent

C# CountdownEvent is a synchronization primitive which unblocks a waiting thread when its receives signal a certain number of times. CountdownEvent is used in fork-join scenarios. As shown in the above diagram, master thread divides its work into 3 parallel tasks. After all parallel tasks are completed, then it joins its results and control goes back to the mas...

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C# Semaphore

C# semaphore allows only a limited number of threads to enter into a critical section. Semaphore is mainly used in scenarios where we have limited number of resources and we have to limit the number of threads that can use it. How Semaphore Works Semaphores are Int32 variables stored in a operating system resources. When we initialize the semaphore object we initiali...

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ManualResetEvent

ManualResetEvent like AutoResetEvent is another synchronization techniques in .NET threading.  ManualResetEvent is used for send signals between two or more threads. Multiple threads can enter into a waiting/blocking state by calling the WaitOne method on ManualResetEvent object. When controlling thread calls the Set method all the waiting threads are u...

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AutoResetEvent

AutoResetEvent is one of the easy synchronization primitives in .NET threading synchronization. AutoResetEvent is used for send signals between two threads. Both threads share the same AutoResetEvent object. Thread can enter into a wait state by calling WaitOne() method of AutoResetEvent object. When second thread calls the Set() method it unblocks the waiting thread....

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Synchronization Tutorials

One of the benefits of using multithreading in .NET is to improve the performance of our applications. We execute long running tasks in the background threads and make the UI thread idle to get the user's inputs. We share resources between multiple threads such as memory. If multiple threads will try to update the data at the same time, the memory get corrupted and ...

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WPF BackgroundWorker

To build more responsive WPF UI, we have to use multiple threads that can work in the background and update the UI when the work completed. But background threads can't access the objects created in the STA. Then how can we update the UI when the background threads completed their work?  WPF applications are based on Single Threaded Apartment Model (STA). Ob...

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