An instance of 'EfDbConfiguration' was set but this type was not discovered in the same assembly as the 'test1' context. Either put the DbConfiguration type in the same assembly as the DbContext type, use DbConfigurationTypeAttribute on the DbContext type to specify the DbConfiguration type, or set the DbConfiguration type in the config file. See http://go.microsoft.com/fwlink/?LinkId=260883 for more information.*

Эти строки - defaultConnectionFactory

<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="mssqllocaldb" />
</parameters>

Вот так

Friend Class DbConfigurationHelper
Inherits Entity.DbConfiguration
Friend Sub New()
SetDefaultConnectionFactory(New Entity.Infrastructure.LocalDbConnectionFactory("mssqllocaldb"))
End Sub
End Class

----------------------------------------

Вот эти строки - providers

<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>

Вот так

Friend Class DbConfigurationHelper
Inherits Entity.DbConfiguration
Friend Sub New()
SetProviderServices(Entity.SqlServer.SqlProviderServices.ProviderInvariantName, Entity.SqlServer.SqlProviderServices.Instance)
End Sub
End Class

----------------------------------------

Вот эти строки - connectionString

<connectionStrings>
<add name="***" connectionString="data source=***;initial catalog=test1;persist security info=True;user id=***;password=***;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />
</connectionStrings>

Реализую вот так

Friend Class DbConnectionHelper

Friend Shared Function ConnectionString() As String

Dim sqlbuilder As New SqlClient.SqlConnectionStringBuilder

sqlbuilder.DataSource = "***"
sqlbuilder.InitialCatalog = "test1"

sqlbuilder.UserID = "***"
sqlbuilder.Password = "***"

sqlbuilder.PersistSecurityInfo = True
sqlbuilder.MultipleActiveResultSets = True
sqlbuilder.ApplicationName = "EntityFramework"

Return sqlbuilder.ConnectionString

End Function
End Class

----------------------------------------

Остается не реализованным только вот эти строки
Как это сделать пока ума не приложу. Гугл не хотит помогать :)

<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>