Are you supposed to take the lens off a dslr camera when putting it in it's case?

I'm new to dslr cameras (a.k.a. "nice" cameras) and am not sure how to store it. The camera fits in my case with the lens still attached if I set it one way, or I can take of the lens and put the body and lens in different compartments. Which is the correct way? I'm kind of afraid of getting... show more I'm new to dslr cameras (a.k.a. "nice" cameras) and am not sure how to store it. The camera fits in my case with the lens still attached if I set it one way, or I can take of the lens and put the body and lens in different compartments. Which is the correct way?

I'm kind of afraid of getting the image sensor dirty if I take the lens off a lot :-) (I only have one lens right now).
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