Update Version History Programmatically

In my webpart I need to populate the data from the sharepoint lists and libraries.

I have an option to change the data in the UI and that should reflect the same in the lists/libraries when i click on 开发者_如何学运维save button.

Problem is even if I am not changing the data and click on save the new versions are adding in my version history with out any changes..

This brings lot of problems in the audit. I need solution/code that it should update the version history only if the item(list row) is changed when we click on save button.

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You need to put this logic in the code itself. Before overwriting the list item, compare the list item with the previous version and if its same, do not overwrite.