Hands-On Design Patterns with C# and .NET Core

A race condition illustration

The following sequence of diagrams visualize what is happening conceptually between two threads: ThreadA and ThreadB. The first diagram shows both threads without any values from the collection:

The following diagram shows that both threads read from the collection of the book with the name of Chester:

The following diagram shows that ThreadA updates the book by increasing the quantity by 4, while ThreadB updates the book by increasing the quantity by 3:

Then, when the updated book is persisted back to the collection, ...