The appropriate solution is storing the Data Source in the Session. Load Post Data to the required controls explicitly via the Dev Express.
Obviously the simplest method is to use Data Key Names on the Grid View and then you should have the data in your Grid View Update Event Args as part of e. (In the following example, I cast to a Check Box as I know I have a checkbox at the col Index You Are Interested In - you should cast to whatever control you have in that column).
As the values are inserted into an Ordered Dictionary - you can use the field names to access the changed data 2.
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When you use Sql Data Adapter for performing updates, the Sql Data Adapter propagates the updates one by one.