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Changing a field value for an item creates an item updated event for which you can add a custom handler.
I have also good and strong knowledge into NET technology.
When we need to validate something or put restriction before adding or modifying data, at that time we need to use Item Adding or Item Updating Event Handler, here I’ll demonstrate how to access fields of List into event handlers.
Example: As per my requirements, I don’t want to add duplicate Name into List.
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Please feel free to post your comments/feedback into my blog, I’ll be more than happy to assistant you.This is the tenth in a series of articles about the basics of developing provider-hosted Share Point Add-ins.You should first be familiar with Share Point Add-ins and the previous articles in this series, which you can find at Get started creating provider-hosted Share Point Add-ins.Microsoft is conducting an online survey to understand your opinion of the Technet Web site.