Multithreading in C# Tutorial | Learn With Examples and Advantages
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Multithreading in C# Tutorial | Learn With Examples and Advantages

Last updated on 01st Feb 2022, Blog, Tutorials

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Manish Kiran (C# Developer )

Manish Kiran is a C# developer expert and subject specialist who has experience with Git, WPF, WinForms, C#,.Net, SQL, .NET Development, VB, .NET Framework,.NET Core, SVN, and Mercurial. His articles help the learners get insights into the domain.

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    • Introduction to C# Multithreading
    • What is Multitasking?
    • What are multithreaded applications?
    • C# Features
    • Solid Programming Features of C#
    • Highlights of C# Structures
    • C# Keywords
    • How would you be able to manage Multithreading in C#?
    • The Thread Life Cycle
    • Benefits
    • Required abilities
    • Kinds of Threads in C#
    • Conclusion

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      Introduction to C# Multithreading

    • Performing multiple tasks is the synchronous execution of various undertakings or cycles throughout a specific time stretch. Windows working framework is an instance of performing various tasks since it is equipped for running more than each interaction in turn like running Google Chrome, Notepad, VLC player, and so on simultaneously. The working framework utilizes a term known as a cycle to execute this multitude of uses simultaneously. An interaction is a piece of a working framework that is liable for executing an application. Each program that executes on your framework is an interaction and to run the code inside the application a cycle utilizes a term known as a string.

    • A string is a lightweight cycle, or as such, a string is a unit that executes the code under the program. So every program has a rationale and a string is answerable for executing this rationale. Each program naturally conveys one string to execute the rationale of the program and the string is known as the Main Thread, so every program or application is as a matter of course a solitary strung model. This single-strung model has a downside. The single string runs every one of the cycles present in the program in synchronizing way, implies in a steady progression. Along these lines, the subsequent cycle delays until the primary interaction finish its execution, which consumes additional time in handling.

    • What is Multitasking?

      Before understanding the idea of Multithreading in C#, let us initially comprehend performing various tasks. Windows working framework is a performing multiple task working framework. It implies it can run different applications simultaneously. For instance, on my machine, I can open the Google Chrome Browser, Microsoft word report, Notepad, VLC Media Player, Windows Explorer, and so on simultaneously. This is conceivable because on my machine I have introduced the Windows working framework and the Windows working framework is a performing various tasks working framework.

      How the working framework executes various applications all at once?

    • To execute all the above applications, the working framework inside utilizes processes. An interaction is a piece of the working framework (or a part under the working framework) that is liable for executing the program or application. Thus, to execute each program or application, there will be an interaction. You can see this utilizing the Task Manager. Spot on click on the Taskbar and snap on the Task Manager choice which will open the Task Manager window.

    • Along a similar line, numerous cycles are running behind the scenes which are known as the foundation processes. These foundation processes are known as windows administrations and the Operating framework runs a ton of windows administrations behind the scenes.

    • Thus, we have a working framework and under the working framework, we have processes that run our applications. So under the interaction, an application runs. To run the code of an application the interaction will utilize an idea called Thread.

    • What are multithreaded applications?

      For quite a while, most programming applications (aside from inserted framework programs) were single-strung. That implies there was just one string in the whole application. You would never do calculation An until finishing calculation B. A program begins at stage 1 and proceeds successively (stage 2, stage 3, stage 4) until it hits the last advance (call it to stage 10). A multithreaded application permits you to run a few strings, each string running in its cycle. So hypothetically you can run stage 1 of every one string and simultaneously run stage 2 in another string. Simultaneously you could run stage 3 in its string, and even stage 4 in its string.

      Thus stage 1, stage 2, stage 3, and stage 4 would run simultaneously. Hypothetically, if each of the four stages took about a similar time, you could complete your program in a fourth of the time it takes to run a solitary string (accepting you had a 4 processor machine). So for what reason isn’t each program multithreaded? Since alongside speed, you face intricacy. Envision if stage 1 in some way relies upon the data in sync 2. The program probably won’t run accurately on the off chance that stage 1 completes the process of ascertaining before stage 2 or the other way around.

      An Unusual Analogy

    • One more method for thinking about various stringing is to think about the human body. Every last one of the body’s organs (heart, lungs, liver, mind) is completely associated with processes. Each interaction is running at the same time. Envision if every organ ran as a stage in a cycle: first the heart, then, at that point, the cerebrum, then, at that point, the liver, then, at that point, the lungs.

    • We would presumably fall and die. So the human body resembles one major multithreaded application. All organs are processes running all the while, and these cycles rely on each other. These cycles convey through nerve signals, bloodstream, and compound triggers. Similarly, as with all multithreaded applications, the human body is extremely complicated. On the off chance that a few cycles don’t get data from different cycles, or certain cycles are delayed down or accelerated, we end up with a clinical issue. That is the reason (similarly as with all multithreaded applications) these cycles should be synchronized appropriately to work regularly.

    • When to Thread

    • Various stringing is most frequently utilized in circumstances where you need projects to run all the more effectively. For instance, suppose your Window Form program contains a strategy (call it method_A) inside it that takes over one moment to run and needs to run drearily. Indeed, on the off chance that the whole program ran in a solitary string, you would see times when button presses didn’t work accurately, or your composing was a cycle slow. Assuming that method_A was computationally adequately serious, you may even notify certain pieces of your Window Form not working by any stretch of the imagination.

    • This inadmissible program conduct is a certain sign that you want multithreading in your program. Another normal situation where you would require stringing is in an informing framework. Assuming that you have various messages being sent into your application, you want to catch them simultaneously your principle handling program is running and disperse them properly.

    • You can’t proficiently catch a progression of messages simultaneously you are doing any weighty handling, because any other way, you might miss messages. Various stringing can likewise be utilized in a mechanical production system design where a few cycles run all the while. For instance, when a cycle gathers information in a string, one interaction channels the information, and one interaction matches the information against a data set. Every one of these situations is normal uses for multithreading and will essentially work on the presentation of comparable applications running in a solitary string.

    • Course Curriculum

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      C# Features

      C# is the article situated on the programming language. It gives many elements that are given underneath.

    • Basic
    • Present-day programming language
    • Object-situated
    • Typesafe
    • Interoperability
    • Versatile and Updateable
    • Part situated
    • Organized programming language
    • Rich Library
    • Quick speed

    • 1. Basic- C# is a basic language as it gives an organized way to deal with (break the issue into parts), a rich arrangement of library capacities, information types, and so forth.

      2. Current Programming Language- C# writing computer programs depends on the latest thing and it is exceptionally strong and basic for building adaptable, interoperable, and vigorous applications.

      3. Object-Oriented- C# is the item situated programming language. Uh oh makes advancement and support simpler though in Procedure-situated programming language it isn’t difficult to oversee assuming code develops as task size develops.

      4. Type- Safe- C# type safe code can get to the memory area that it has consent to execute. Subsequently, it works on the security of the program.

      5. Interoperability- The interoperability cycle empowers the C# projects to do nearly anything that a local C++ application can do.

      6. Versatile and Updateable- C# is the programmed versatile and updateable programming language. For refreshing our application we erase the old documents and update them with new ones.

      7. Part Oriented- C# is a part situated programming language. It is the dominating programming improvement technique used to foster more powerful and exceptionally adaptable applications.

      8. Organized Programming Language- C# is an organized programming language as in we can break the program into parts utilizing capacities. In this way, it is straightforward and changes.

      9. Rich Library- C# gives a ton of inbuilt capacities that make the improvement quick.

      10. Quick Speed- The arrangement and execution season of the C# language is quick.

      Solid Programming Features of C#

      Although C# builds intently follow customary significant level dialects, C and C++ and being object-arranged programming dialects. It has a solid likeness with Java, it has various solid programming highlights that make it charming to certain developers around the world. Following is the rundown of a couple of significant highlights of C# −

    • Boolean Conditions
    • Programmed Garbage Collection
    • Standard Library
    • Get together Versioning
    • Properties and Events
    • Agents and Events Management
    • Simple to-utilize Generics
    • Indexers
    • Restrictive Compilation
    • Basic Multithreading
    • LINQ and Lambda Expressions
    • Incorporation with Windows

    • Highlights of C# Structures

      You have as of now utilized a straightforward construction named Books. Structures in C# are very not quite the same as that in conventional C or C++. The C# structures have the accompanying highlights −

    • Constructions can have strategies, fields, indexers, properties, administrator techniques, and occasions.
    • Designs can have characterized constructors, yet not destructors. Be that as it may, you can’t characterize a default constructor for a design. The default constructor is naturally characterized and can’t be changed.
    • Dissimilar to classes, structures can’t acquire different designs or classes.
    • Structures can’t be utilized as a base for different designs or classes.
    • A construction can carry out at least one connection point.
    • Structure individuals can’t be indicated as dynamic, virtual, or safeguarded.
    • At the point when you make a struct object utilizing the New administrator, it gets made and the proper constructor is called. In contrast to classes, structs can be launched without utilizing the New administrator.
    • On the off chance that the New administrator isn’t utilized, the fields stay unassigned and the article can’t be utilized until every one of the fields is introduced.

    • Part Variables

      Factors are traits or information individuals from a class, utilized for putting away information. In the former program, the Rectangle class has two-part factors named length and width.

      Part Functions

      Capacities are a set of explanations that play out a particular errand. The part elements of a class are announced inside the class. Our example class Rectangle contains three-part works: AcceptDetails, GetArea, and Display.

      Launching a Class

      In the first program, the class ExecuteRectangle contains the Main() technique and launches the Rectangle class.


      An identifier is a name used to distinguish a class, variable, work, or some other client characterized thing. The essential standards for naming classes in C# are as per the following −

    • A name should start with a letter that could be trailed by a grouping of letters, digits (0 – 9), or highlights. The principal character in an identifier can’t be a digit.
    • It should not contain any implanted space or image, for example, – + ! @ # % ^ and * ( ) [ ] { } . ; : ” ‘/and \. Notwithstanding, a highlight ( _ ) can be utilized.
    • It ought not to be a C# catchphrase.

    • C# Keywords

    • Catchphrases are held words predefined to the C# compiler. These catchphrases can’t be utilized as identifiers. Be that as it may, to involve these watchwords as identifiers, you might prefix the catchphrase with the @ character.
    • In C#, a few identifiers have extraordinary significance with regards to code, for example, get and set are called logical watchwords.
    • The accompanying table records the held catchphrases and logical watchwords in C#

    • How would you be able to manage Multithreading in C#?

      By utilizing Multithreading, you can execute various undertakings at the same time throughout a specific time stretch. As we have talked about, each program shows inside an application utilizing a string. Subsequently, the string is answerable for executing the rationale of each program which is regularly known as the Main Thread of an application. In the current circumstance, each application utilizes various stringing. An application contains a UI string that can cooperate with the client and foundation laborer strings that perform different assignments.

      Issues with Threading

    • Assuming each cycle in your program was unrelated – that is, no interaction relied in any capacity on another, then, at that point, various stringing would be exceptionally simple, and not many issues would happen. Each cycle would run along in its blissful course and not trouble different cycles. Notwithstanding, when excess is to peruse or compose the memory utilized by different cycles, issues can happen.

    • For instance suppose there are two cycles, process #1 and process #2. The two cycles share variable X. Assuming that string cycle #1 composes variable X with the worth 5 first and string process #2 composes variable X with esteem – 3 next, the last worth of X is – 3. In any case, if cycle #2 composes variable X with esteem – 3 first and, interaction #1 composes variable X with esteem 5, the last worth of X is 5.

    • In this way, assuming the interaction that permits you to set X doesn’t know process #1 or process #2, X can wind up with various last qualities relying on which string got to X first. In a solitary strung program, it is impossible that this could happen because everything continues in an arrangement. In a solitary strung program, since no cycles are running in equal, X is set all the time by strategy #1 first, (on the off chance that it is called first) and set by technique #2.

    • There are no curveballs in a solitary strung program, it’s simply ventured by step. With a multithreaded program, two strings can enter a piece of code simultaneously, and unleash devastation on the outcomes. The issue with strings is that you want some method for controlling one string getting to a common piece of memory while another string running simultaneously is permitted to enter a similar code and control the common information.

    • String Safety

    • Envision assuming each time you shuffled three balls, the ball in the air, by some oddity, was never permitted to arrive at your right hand until the ball previously sitting in your right hand was tossed. Students would shuffle be significantly simpler! This is what’s going on with string wellbeing. In our program, we constrain one string to stand by inside our code block while the other string is completing its business.

    • This action, known as string obstructing or synchronizing strings, permits us to control the circumstance of concurrent strings running inside our program. In C# we lock on a specific piece of memory (normally an example of an article) and don’t permit any string to enter the code of this current item’s memory until another string is finished utilizing the article. At this point, you are most likely craving a code model, so here you go.

    • How about we investigate a two-string situation. In our model, we will make two strings in C#: Thread 1 and Thread 2, both running in their while circle. The strings will do nothing valuable, they will simply print out a message saying which string they are essential for. We will use a common memory class part called _threadOutput.

    • C# – Properties

    • Properties are named individuals from classes, designs, and points of interaction. Part factors or strategies in a class of constructions are called Fields. Properties are an expansion of fields and are gotten to utilizing a similar linguistic structure. They use accessors through which the upsides of the private fields can be perused, composed, or controlled.

    • Properties don’t name the capacity areas. All things being equal, they have accessors that perused, compose, or register their qualities.

    • For instance, let us have a class named Student, with private fields for age, name, and code. We can’t straightforwardly get to these fields from outside the class scope, however, we can have properties for getting to these private fields.

    • C# – Program Structure

      The principal line of the program utilizing System; – the utilizing catchphrase is utilized to incorporate the System namespace in the program. A program for the most part has numerous utilizing articulations.

    • The following line has the namespace announcement. A namespace is an assortment of classes. The HelloWorldApplication namespace contains the class HelloWorld.
    • The following line has a class announcement, the class HelloWorld contains the information and technique definitions that your program employments. Classes for the most part contain numerous strategies. Techniques characterize the conduct of the class. Notwithstanding, the HelloWorld class has just a single strategy Main.
    • The following line characterizes the Main strategy, which is the passage point for all C# programs. The Main technique states what the class does when executed.
    • The following line/…/is overlooked by the compiler and it is placed to add remarks in the program.
    • The Main strategy indicates its conduct with the assertion Console.WriteLine(“Hello World”);
    • WriteLine is a strategy for the Console class characterized in the System namespace. This assertion causes the message “Hi, World!” to be shown on the screen.
    • The last line is Console.ReadKey(); is for the VS.NET Users. This makes the program sit tight for a keypress and it keeps the screen from running and shutting rapidly when the program is sent off from Visual Studio. NET.

    • Course Curriculum

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      It is important the accompanying focuses −

    • C# is case-touchy.
    • All assertions and articulations should end with a semicolon (;).
    • The program execution begins with the Main strategy.
    • Not at all like Java, the program record name could be unique from the class name.
    • Accumulating and Executing the Program

    • Assuming that you are involving Visual Studio.Net for arranging and executing C# programs, make the accompanying strides −

    • Start Visual Studio.
    • On the menu bar, pick File – > New – > Project.
    • Pick Visual C# from formats, and afterward pick Windows.
    • Pick Console Application.
    • Determine a name for your venture and snap the OK button.
    • This makes another venture in Solution Explorer.
    • Compose code in the Code Editor.
    • Click the Run button or press the F5 key to execute the undertaking. A Command Prompt window gives the idea that contains the line Hello World.

    • You can arrange a C# program by utilizing the order line rather than the Visual Studio IDE −

    • Open a content tool and add the previously mentioned code.
    • Save the document as HelloWorld.cs
    • Open the order brief instrument and go to the catalog where you saved the document.
    • Type CSC HelloWorld.cs and press enter to arrange your code.
    • On the off chance that there are no blunders in your code, the order brief takes you to the following line and produces a helloworld.exe executable record.

    • The Thread Life Cycle

      The string life cycle embodies the existence of a string. It begins when an object of System.Threading.Thread class is made and closes when the string has ended. The string states in the string life cycle are given as follows:

      Unstarted StateWhen the example of the string has been made however the Start strategy has not been called, that is the unstarted state.

      Prepared State- Whenever the string is prepared to run, it is in the prepared state. This string is simply sitting tight for the CPU cycle.

      Not runnable State- A string can be in the not runnable state when the standby or rest strategy has been called. This state can likewise happen to assume the string is obstructed as a result of I/O activities.

      Dead State- The string enters the dead state assuming it is cut short or on the other hand if it has finished its execution.

      Benefits :

      Multithreading permits the execution of different pieces of a program simultaneously. These parts are known as strings and are lightweight cycles accessible inside the interaction. So multithreading prompts the most extreme usage of the CPU by performing various tasks.

      Asset Sharing

      Every one of the strings of an interaction shares its assets like memory, information, documents, and so forth A solitary application can include various strings inside a similar location space utilizing asset sharing.


      Program responsiveness permits a program to run regardless of whether the portion of it is impeded utilizing multithreading. This should likewise be possible if the interaction is playing out an extended activity. For instance – An internet browser with multithreading can involve one string for client contact and one more for picture stacking simultaneously.

      Usage of Multiprocessor Architecture

      In multiprocessor engineering, each string can run on an alternate processor in equal utilizing multithreading. This expands the simultaneousness of the framework. This is in direct differentiation to a solitary processor framework, where just one interaction or string can run on a processor at a time.


      It is more efficient to involve strings as they share the cycle assets. Similarly, it is more costly and tedious to make processes as they require more memory and assets. The upward for process creation and the board is a lot higher than string creation and the executives.

      Required abilities

      Multithreading depends on the C and C++ programming dialects. If you have a fundamental comprehension of C or C++ programming, you can undoubtedly learn C#. It follows the highlights of undeniable level dialects like C or C++ and being an article arranged language, it has a solid likeness portrayal with Java.

      Alongside the above abilities, the up-and-comer ought to have the beneath abilities which could help in creating applications:

    • Information bases
    • Microsoft Certified Solutions Developer (MCSD)
    • Microsoft Most Valuable Professional (MVP)
    • WEB API
    • Sky blue
    • SharePoint
    • Other JavaScript libraries and systems

    • Kinds of Threads in C#

      Multi-stringing is the most valuable component of C# which permits simultaneous programming of at least two pieces of the program for expanding the usage of the CPU. Each piece of a program is called Thread. Thus, at the end of the day, strings are lightweight cycles inside an interaction. C# upholds two sorts of strings are as per the following :

      Closer view Thread

      A string that continues to rush to finish its work regardless of whether the Main string leaves its interaction, this sort of string is known as a closer view string. The frontal area string doesn’t mind at all whether or not the principle string is alive, it finishes just when it completes its appointed work. Or then again, all in all, the existence of the frontal area string doesn’t rely on the principle string.

      Clarification: In the above model, the string pursues the primary string finished. Along these lines, the existence of the string doesn’t rely on the existence of the fundamental string. The string possibly closes its cycle when it does its doled-out responsibility.

      Foundation Thread

      A string that leaves its interaction when the Main strategy leaves its cycle, these kinds of strings are known as the foundation strings. Or then again, all in all, the existence of the foundation string relies on the existence of the primary string. If the primary string completes its interaction, the foundation string additionally closes its cycle.

      Multithreaded programs versus single-strung projects upsides and downsides

      Multithreaded applications enjoy the accompanying benefits versus single-strung ones:

      Responsiveness: multithreading can permit an application to stay receptive to entering. In a one-string program, on the off chance that the primary execution string blocks on a long-running errand, the whole application can seem to freeze. By moving such long-running undertakings to a specialist string that runs simultaneously with the fundamental execution string, the application can stay receptive to client input while executing assignments behind the scenes. Then again, by and large, multithreading isn’t the best way to keep a program responsive, with non-impeding I/O or potentially Unix signals being accessible for acquiring comparative outcomes.

      Deeply or in equal on various centers. GPU figuring conditions like CUDA and OpenCL utilize the multithreading model where handfuls to many strings run in equal across information on countless centers. This, thus, empowers better framework use, and (given that synchronization costs don’t gobble the advantages up), can give quicker program execution.

      Multithreaded applications have the accompanying downsides:

      Synchronization intricacy and related bugs: while utilizing shared assets run-of-the-mill for strung projects, the software engineer should be mindful to stay away from race conditions and other non-instinctive practices. For information to be accurately controlled, strings will regularly have to meet on schedule to deal with the information all put together.

    • Strings may likewise require unrelated activities (regularly executed utilizing mutexes) to keep normal information from being perused or overwritten in one string while at the same time being altered by another. Imprudent utilization of such natives can prompt halts, livelocks, or races over assets. As Edward A. Lee has expressed: “Although strings appear to be a little advance from consecutive calculation they address a gigantic advance.

    • They dispose of the most fundamental and engaging properties of consecutive calculation: understandability, consistency, and determinism. Strings, as a model of calculation, are fiercely non-deterministic, and the occupation of the developer becomes one of pruning that nondeterminism.”

    • Being untestable. As a rule, multithreaded programs are non-deterministic, and therefore, are untestable. As such, a multithreaded program can undoubtedly have bugs that never manifest on a test framework, showing just underway. This can be eased by confining between string correspondences to specific obvious examples, (for example, message-passing).

      Synchronization costs. As string setting switches on current CPUs can cost up to 1 million CPU cycles, it makes composing proficient multithreading programs troublesome. Specifically, unique considerations must be paid to keep away string synchronization from being excessively continuous.

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    • Scarcely any areas of writing computer programs are more loaded up with fantasies than string the board is. Strings can turn into a bad dream assuming that you adopt a wayward strategy because once you begin utilizing strings you’re quickly helpless before the working framework scheduler. Your string code might endure starvation, or you might find coincidentally that you’ve composed code that isn’t strung safely. Or then again you might see that your code finds itself mixed up with a halt.

    • These issues can stay away from assuming you apply a strong plan approach, which provides you with all the impressive force of multithreaded code. This article has shown how a long-running, complex programming transfer technique can be made responsive and offbeat all with only a couple of lines of code.

    • There’s not a great explanation for why you shouldn’t consolidate multithreaded code into your endeavors. It’s a strong instrument, and the stages are making it simpler than at any other time to accomplish.

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