I have a SSIS 2014 Package created in Visual Studio 2013. I have successfully performed a simple Data Flow from one table to another. I am now wondering how to apply additional logic: 1. Check for Existence of data, then either update or insert new data into a table's column, and 2. Avoid data duplication. Any help on coding C# or T-SQL for this small, modest task would be greatly appreciated. Thank you.