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The link below provides a code snippet for editing an ArcSDE table with ArcObjects.
Are there any other or newer code examples out there of how to edit an ArcSDE table by using ArcObjects?
Edit SDE geodatabase table w/ ArcObjects
Here's a few to get you started:
Start Here - Learning ArcObjects
Connecting to a GeoDatabase
Creating and Modifying Schema
And in specific you can look at Creating Features and Updating Features. Both of these will require you to connect to your GeoDatabase, which you can find samples for above.
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