Today I installed Ubuntu 18.04 LTS i.e. Bionic Beaver, alongside Windows 10 and overall it's really awesome. Even though I installed Ubuntu the main OS which I still use is Windows 10 since Visual Studio is what I use for development in Xamrin or other .Net stuff.
So after installing Ubuntu in Grub the Default OS is Ubuntu, so every time I start my PC it by default starts Ubuntu. Of course Grub gives you the option of which OS to load but in case you missed it for 10 seconds than it will automatically load Ubuntu.

So follow the below steps to make Windows 10 as your default operating system:

Install Grub Customizer Software

• Boot into Ubuntu OS.
• Open Terminal

• In terminal run command "sudo add-apt-repository ppa:danielrichter2007/grub-customizer". Enter password whenever it prompts.
  
• Now run "sudo apt-get update".
• Once done, run "sudo apt-get install grub-customizer".

Once above steps are followed Grub Customizer will installed successfully.

Set the Default Boot Order

• Search for "Grub Customizer" and launch it.

• Once you launch it will ask you to authenticate, please enter your password and click Authenticate.
  
• Once launched you will be to see Windows 10 in the list. Select that item and click the Up arrow at the top of the application to re-arrange your default OS.
• Once you have set, don't forget to Save it.

• Now restart your computer and it will boot to Windows 10 by default.

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The method above will run synchronously until the await expression is reached, at which point the method is suspended and execution returns to the caller. The awaited Task is scheduled to run in the background on the same thread. As a convention, asynchronous method should be named in the form of xxxAsync.

Task Class

Async methods can return Task, Task<T> or void. Task is simply an implementation of IAsynchResult. When method returns Task<T> then it is awaitable and that means you can call it using keyword await to suspend itself until after the task is finished.

How to do it?

Now let’s see how we can create Async methods.

·         First let’s open Visual Studio and create a new Console Application called AsyncFileProcessing.

·         Add the below code in the Main function:

·         Now build and run the application. As you see we are awaiting the reading of File to be completed. In the meantime if you see Console is still responsive and user can type on it.

·         Once the task is completed, you can see the below result.

In the above example under Main method we simply create the ProcessAsync method which we start and wait for it to finish. Now within ProcessAsync method we have the following statement:

var data = await task;

The above statement tells the method to start the task and wait till it’s completed. And when its waiting application is not freezed and it is still responsive. And similarly if you look “ReadFileAsync” we have the below statement:

data = await reader.ReadToEndAsync();

Above statement reads the file data asynchronously.


Rules and Limitations

While usage of async and await is very flexible but still there are some limitation which we need to take care of. Below are the notable ones.

·         In C# 5.0 you can’t use await in catch and finally block. Things have changed in C# 6.0 and Developers can actually use await in catch and finally block.

·         Constructors and property accessors cannot be marked as async and use await

• An async method cannot have a ref or out parameters
• The await keyword may not be used in the body of a lock statement.

Summary

C# 5.0 and Framework 4.5 has taken a huge leap in terms of asynchronous programming and with new release of C# 6.0 more and more features are getting added in terms of Async programming. In the upcoming tutorial I will try to cover some additional async programming features.