Async Await in C# | C# Async Await Explained With Example | C# Tutorial For Beginners | Simplilearn

hey everyone i am weber khandelwal and i welcome you all to yet another exciting video from simply learn in this session we will be discussing async and await in c-sharp however before we begin this session make sure that you have subscribed to our youtube channel and clicked on the bell icon below so you never miss an update from simply learn now let's look at the agenda for today's topic we shall begin our session with an introduction to asynchronous programming then we will discuss the need for asynchronous programming after that we will look into async and await keyword then we will look at the demo of async and await finally we will conclude this session with differences between asynchronous and sicros programming so without any further ado let's get started with what is asynchronous programming the application can work on other tasks while waiting for the task to be completed using asynchronous programming asynchronous programming is very popular in c-sharp thanks to the async and await keyword when dealing with the ui we use a long-running method like reading a large file or something similar if any synchronous process is blocked the entire application will be blocked and our application will stop responding until the task is completed and if there is no await operator in the async method then the method will execute synchronously now let's discuss the need for asynchronous programming in synchronous programming compilers run one statement and wait for it to complete and then move to the next one whereas in asynchronous programming compilers run one statement and while it gets completed we will also work on the next one now we will discuss async and await keywords first up async keyword asynchronous methods are created by using async modifier on a method an async method runs synchronously until it reaches its first await operator at which point it suspends an async method runs synchronously until it reaches its first await operator at which point it suspend next up a wait while the asynchronous operation is running this await operator suspend the async method when the asynchronous operation completes the await operator returns the result and if there is no await operator in the async method then the method will be executed synchronously next let's try it in the code editor let's start by creating a class class program we will create a main function which will be static void main string args then we will declare method 1 and method two these will be the two method which we will be calling simultaneously then console dot read key now let's create a asynctask method1 so public static async task and method1 then we will call the await keyword with task dot run and we will include another small bracket and go out of it and equals to with greater than in this we will declare a for loop and i equals to zero and we will run it 100 times until i plus plus then we will print console dot writeline method one is running now we will add a delay for this task so it will queue up different tasks we will give it 100 milliseconds of task delay so it will be finished in 100 milliseconds and dot wait we will close this with the semicolon now let's write a public method or two repeat now let's write definition for method two it will be a simple function definition so public static void method two a for loop and i is equals to 0 i less than 25 i plus plus console dot write line and we will print method to is running and we will give it the task delay of 100 dot wait here the code will start with the method1 when it will come to await task then it will run this for loop and print method one is running and then it will trigger this delay operation when this delay operation will be triggered it will stop for 100 millisecond while that time the method two will be executed because of the async property now while this method two is working when it will hit the avail method it will again come back to the method one now this method 2 is only running 25 times so after a point the method 2 will stop running and then the method 1 will work as normally let's try and run this let's save first as you can see these methods are starting working you can see that method 2 is running not that simultaneously as method1 is running that's because the method 2 is low in number now let's get back to our slides we have now discussed asynchronous programming async and await keywords in detail now let's look at the differences between asynchronous and synchronous programming first up using asynchronous programming the application can work on other tasks without waiting for the task to be completed whereas the synchronous programming allows us to run one task at a time also the async modifier is used on a method to create an asynchronous method finally while the asynchronous operation is running the await operator suspends the async method evolution and this was all for today's session hope you guys found it informative and helpful if you like this session then like share and subscribe if you have any question then you can drop them in the comment section below thanks for watching and stay tuned for more from simply learn hi there if you like this video subscribe to the simply learn youtube channel and click here to watch similar videos turn it up and get certified click here

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Views: 35,560

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Id: B8n-a2qS4Gg

Length: 11min 19sec (679 seconds)

Published: Tue Jan 04 2022