Async and Await are the two keywords that help us to program asynchronously. An async keyword is a method that performs asynchronous tasks such as fetching data from a database, reading a file, etc can be marked as “async”. Whereas await keyword making “await” to a statement means suspending the execution of the async method it is residing in until the asynchronous task completes. After suspension, the control goes back to the caller method. Once the task completes, the control comes back to the states where await is mentioned and executes the remaining statements in the enclosing method.
When we are dealing with UI on button click, we use a long-running method like reading a large file or something else which will take a long time, in that case, the entire application must wait to complete the whole task. In other words, if any process is blocked in a synchronous application, the whole application gets blocked, and our application stops responding until the whole task completes. By using Asynchronous programming, the Application can continue with the other work that does not depend on the completion of the entire task.
We can run all the methods parallelly by using simple thread programming, but it will block UI and wait to complete all the tasks. To come out of this problem, we have to write too many codes in traditional programming, but if we use the async and await keywords, we will get the solutions in much less code.
