https://learn.microsoft.com/cs-cz/dotnet/api/system.collections.generic.synchronizedcollection-1?view=netframework-4.8.1&viewFallbackFrom=net-10.0
SynchronizedCollectionT Class (System.Collections.Generic) | Microsoft Learn
Provides a thread-safe collection that contains objects of a type specified by the generic parameter as elements.
class systemcollectionsgenericmicrosoftlearn