Entity Framework - Add Existing Database

Question

I'm trying to add a database using the Entity Data Model Wizard and keep on getting an error "An Item with the same key has already been added."

EF Designer from Database > New Connection > Error

This is a new connection that I'm working with. Where can I view what keys are entered?

you have Table which contains the same Column twice.

Nazmul Hasan
– Nazmul Hasan

2016-05-09 20:15:57 +00:00
Commented May 9, 2016 at 20:15 — Nazmul Hasan
– Nazmul Hasan, Commented May 9, 2016 at 20:15

Hasan Hasanov · Accepted Answer · 2016-05-09 20:29:34Z

2

I had the same problem a while ago and found out that I have model with the same property twice. Just rename that property and it should work fine.

answered May 9, 2016 at 20:29

Hasan Hasanov

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Vivian River Over a year ago

I've seen this problem, too!

Nazmul Hasan · Accepted Answer · 2016-05-09 21:29:28Z

2

Make sure that what you key in for "Save connection settings in Web.Config" is unique. You can browse the web.config file to see what connections you've already saved.

edited May 9, 2016 at 21:29

Nazmul Hasan

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answered May 9, 2016 at 20:22

Vivian River

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