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Asynchronous programming

Asynchronous Programming

Asynchronous programming is an effective solution for blocked or delayed access to resources. Suppose an activity in a synchronous process is blocked in a way, that the entire program must wait, which increases processing time.

It should be used if your demands are I/O-bound (for example, reading and writing to a file system, accessing a database, or requesting data via a network). Another case that is advantageous for developing async code is when you have CPU-bound code, such as when you are conducting an expensive calculation.

Async programming in C# uses the async and await keywords. You can use them to work with .NET Framework and.NET Core resources, among other things. Async methods are asynchronous methods specified with the async keyword.


This keyword designates a function as being asynchronous. To put it another way, we can invoke a function asynchronously if we prefix it with the async keyword.
public async void CallAnyfunction() { }


We do use this keyword when calling any function asynchronously.
Suppose we have a long-running process.
static void Main()
var count = await Method1(); //used await keyword
Method2(count); //dependent on method1
public static async Task<int> Method1()
int count = 0;
await Task.Run(() =>
for (int i = 0; i < 100; i++)
Console.WriteLine(" Method 1");
count += 1;
return count;
public static void Method2(int count)
Console.WriteLine("Total count is " + count);

Advantages of using this approach:

  • Maintain UI responsiveness
  • Possibility of improving performance by parallel processing
  • Avoid running out of the thread pool by “stopping” execution during asynchronous activity and freeing threads into the thread pool.
  • Performance Improvement

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