Keyword default! in C# 10

default-keyword-in-CSharp.cs

//Q: explain the meaning of default in
private DispatcherTimer timer = default!;

/*
Bard::
Sure. The default keyword in the code private DispatcherTimer timer = default!; means that the timer variable will be initialized with the default value for a DispatcherTimer object. In this case, the default value is a DispatcherTimer object that is not running and has a Interval of 0 milliseconds.
The default! syntax is a new feature in C# 10 that allows you to explicitly specify that the default value should be used. This is useful for preventing the compiler from inferring the wrong type for the variable. In this case, the compiler could have inferred that the timer variable is a Nullable<DispatcherTimer> object, but the default! syntax prevents this from happening.

Here is a breakdown of the code:
•	private - This keyword specifies that the timer variable is private. This means that it can only be accessed by other members of the class in which it is declared.
•	DispatcherTimer - This is the type of the timer variable. A DispatcherTimer object is used to schedule events to run on the Dispatcher thread.
•	timer = default!; - This line of code initializes the timer variable with the default value for a DispatcherTimer object.

I hope this explanation is helpful. Let me know if you have any other questions.
*/