upgrade list instance in sharepoint 2010?

Question

0

I have created list definition with two list instances now i want to add two new columns in list instance 1 and 2 , but when i redeploy my solution through visual studio older versions of list instances are deleted and newer versions are created and i lose my old data.

is there any way that i can upgrade list instances without losing the old data?

thanks,

Gaurav

Answer 1

you can not update list instances by creating new instance. suggested way would be to create a feature reciever and add new columns to existing lists using object model

you can also write a simple console application to achieve the same.

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Best Regards, Ashutosh | SharePoint World

Answer 2

Ashutosh is correct.  To add to his response, if you're using the feature upgrading/versioning capabilities of 2010, you could also customize your solution to provide the necessary upgrade steps depending on the version of the feature installed.

Chris has a great post about this...

http://www.sharepointnutsandbolts.com/2010/06/feature-upgrade-part-1-fundamentals.html