9 - Model First Approach | Entity Framework 6

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Want to design your database schema on the visual designer and then create the database and classes.
This video explains how to use Entity Framework to generate Database and Domain classes from design surface on EDMX
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When i make the connection and finally choose the Entity Framework version it says that "An item with the same key has already been added" and no sql file is created. What am i doing wrong?

tomasoom
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i want to do c# EF core aggregate model project. can you please help me on this?

AnishaRavilla