Method 'ExecuteAsync' in type 'System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy' does not have an implementation

Question

I am newer about using Code First in c#. After I enabled Migration in my project and launch my site, I get an Error:

Method \'ExecuteAsync\' in type \'System         


        

Answer 1

Since all similar S/O questions are being directed to this one, I'll leave another idea to consider. Check to make sure that EntityFramework hasn't been installed into you GAC by chance. IIS will take the GAC version over your bin version leading to some serious head scratching.