Once you file your application for bankruptcy, an automatic stay is place on your case.  What this means is that none of your creditors are able to proceed with any collection attempts against you.  This also ensures that all your creditors are place in the same equal position so that no one can do anything to the determent of the others.

If any creditors proceeds with any action despite the stay, their actions are automatically void by the law.  You do not need to take any action.  They can also face possible legal consequences if the creditor takes action knowing you have filed you application.

For example, say you are rental space in the local mall for your business.  You file for bankruptcy and your landlord proves forward to lock you out.  The landlord can be found liable for your lost of business during the period that you were locked out of your business – preventing you from operating your business.