EF5 Code First Migration problems publishing to IIS - entity-framework

Question

I've created a MVC 4 project which uses EF5 Code First with migrations.
Because I was new to this topic I used the following article.
Now that the development is finished I want to publish to IIS (I use FTP or Web deployment package). So before publishing I changed the connectionstring to the right db server.
But after publishing the site I get an exception when accessing pages which make use of the DB. The exceptions refers to the fact that he can't connect to the database.
Because of these problems I decided to try it out locally on another DB server than the default one "(LocalDB)\v11.0". BTW: "(LocalDB)\v11.0" works like a charm...
While debugging I got a better look at the error.
Here is an image of the error:
What I've already tried:
Generate a sql script by executing "Update-Database -Script
-SourceMigration:$InitialDatabase" in the Package manager console. After I ran this script on the dbserver to create the db. Tables were
created but the error was still there.
I changed my connectionstring to all kinds of combination with no
results
I already used a custom user for the app pool in ISS and gave this user full rights to the DB server and the db.
Here is the most important part of my web.config:
<connectionStrings>
<add name="DefaultConnection" providerName="System.Data.SqlClient" connectionString="Data Source=LOCALHOST\MSSQLSERVER;Initial Catalog=ProjectX;Integrated Security=TRUE;MultipleActiveResultSets=True" />
</connectionStrings>
And
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
<parameters>
<parameter value="Data Source=LOCALHOST\MSSQLSERVER; Integrated Security=True; MultipleActiveResultSets=True" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
My DBCcontext class constructor looks like
public DBContext(): base("DefaultConnection")
{
}
I guess I am missing something, this is the first time I use EF Code First with migrations.
This problem is really driving me crazy. I am out of ideas.

Answer 1

Just found out that the problem was caused by the connectionstring.
The string was incorrect, seems like you if you have a default SQL Server you just need to use
"Data Source=LOCALHOST".
I guess because of all the problems I had that day with the deployment i overlooked the easy parts. Yust make sure you the following things are true when you have problems like I did:
Your connectionstring has the same name as your DBContext. Another sollution could be to do like i did and add the connectionstring name to the base:
public DBContext(): base("DefaultConnection")
{
}
If you also have the defaultconnectionfactory set. Make sure to also update the Data Source there. This was one of the problems I struggled with. I didn't check the bottom of my web.config ...
If the problem still persists you can use EF profiler to have a look at the connectionstring when your app of site is accessing the DB.