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Possible Duplicate:
Are reads and writes to properties atomic in C#?
Are the auto-generated setters atomic in .NET 4?
Public property Busy As boolean
They are not guaranteed to be.
Consider that the above compiles to a full form property with a backing field. A different thread may come in between the setter invocation and the actual assignment of the backing field.
Also, not all types can be assigned atomically – large value types (
DateTime,TimeSpanetc…) are too large for an atomic assignment.