Multithreading and booleans

Question

I have a class that contains a boolean field like this one:

public class MyClass
{
    private bool boolVal;
    public bool BoolVal
    {
        get { return boolVal; }
        set { boolVal = value; }
    }
}

The field can be read and written from many threads using the property. My question is if I should fence the getter and setter with a lock statement? Or should I simply use the volatile keyword and save the locking? Or should I totally ignore multithreading since getting and setting boolean values atomic?

regards,