Using lock statement within a loop in C#

Question

Lets take the sample class SomeThread where we are attempting to prevent the DoSomething methods from being called after the Running property is set to false and Dispose is

Answer 1

Check Running again inside the lock:

while (Running)
{
    lock(locker)
    {
        if(Running) {
            DoSomething1();
            DoSomething2();
        }
    }
}

You could even rewrite this as a while(true)...break, which would probably be preferable.