Toast notifications for WPF allows you to create and display rich notifications in WPF applications. It's highly configurable with set of built-in options like positions, behaviours, themes and many others. It's extendable, it gives you possibility to create custom and interactive notifications in simply manner.
When adding notification in multiple thread at the same time, some item will not be added to dict because _id changed to later one.
Reason: even the increment operation was locked, the use of _id was not locked. _id may change in the following lines.