What is the purpose of the ConcurrencyStamp column in the AspNetUsers table in the new ASP.NET MVC 6 identity?

Question

What is the purpose of the ConcurrencyStamp column in the AspNetUsers table in the new ASP.NET MVC 6 identity?

This is the database schema

Answer 1

Also important to realize that this is actually a data layer feature. The schema for Identity defines the column as being a concurrency column but doesn't actually use it.

There's no logic going on inside the Identity codebase - it's only when EFCore actually goes to save it that it kicks in.

https://docs.microsoft.com/en-us/ef/core/modeling/concurrency

EF Code First - IsConcurrencyToken()