The lock statement ensures that one thread can hold the object being locked at at a given time and other threads attempting to lock that object are blocked until the lock is released - usually when the block is exited.

With C# 13 a new System.Threading.Lock object is introduced that can be used with the lock statement and using directive. The Lock object is a disposable object that can be used to lock a block of code and automatically release the lock when the block is exited.

Notes

• Using lock with a new Lock object will use it's methods to provide locking and unlocking
• Other objects continue to be wrapped by System.Thread.Monitor

More information

• What's new in C# 13.0
• Proposal