What Is The Difference Between OCC and PCC in Ax 2012

Optimistic Concurrency Control (vs) Pessimistic Concurrency Control

Pessimistic Concurrency Control :

                                                    On updating the data, the record gets locked and no one else can access that record for updating. It becomes a read-only record till the lock is released. Once the lock gets released, the record can be locked again and get updated for a different user.

Optimistic Concurrency Control :
                                                    This allows multiple user to open up the same record for updation . Record gets locked only while updating the record. This is the most preferred way of locking for the web application.

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Calling Sequence Of Methods In FORM Level in Ax 2012

Hi Every one, today i would like to share my knowledge on Calling Sequence Of Methods in Form Level. Each form has a set of standard methods. You can override these methods to change the behavior of the form, respond to user interface events, and customize the appearance of a form.There are also methods on each form data source and on each form control.
Below scenarios gives the information of  method calls in the form level 

1. Opening the Form.
2. Creating/Updating/Deleting the record in the Form.
3. Closing the Form.