Entity Framework 4.3. Invalid column name 'CreatedOn'

Question

I\'m developing an ASP.NET MVC 4 application using VS 2010 and EF 4.3. It retrieves some data from an external database and all worked as expected until I tried to recompile

Answer 1

EF 4.3.1 added a CreatedOn column to the __MigrationHistory table, which EF 5.0 subsequently removed. I suspect you have upgraded EF to 4.3.1 since you last updated the database.

You could either run a Migration to add the CreatedOn column, manually add it yourself, or upgrade to EF 5.0 where it is no longer necessary.