Question - What Is Sta In .net?
Answer -
single-threaded apartments (the apartment model process) offers a message-based paradigm for dealing with multiple objects running concurrently. It enables you to write more efficient code by allowing a thread, while it waits for some time-consuming operation to complete, to allow another thread to be executed.
Each thread in a process that is initialized as an apartment model process, and that retrieves and dispatches window messages, is a single-threaded apartment thread. Each thread lives within its own apartment. Within an apartment, interface pointers can be passed without marshaling, and therefore, all objects in one single-threaded apartment thread communicate directly.
A logical grouping of related objects that all execute on the same thread, and therefore must have synchronous execution, could live on the same single-threaded apartment thread. However, an apartment model object cannot reside on more than one thread. Calls to objects in other processes must be made within the context of the owning process, so distributed COM switches threads for you automatically when you call on a proxy.