Read connection string from app.config in my DataAccess library project for dbContext - connection-string

Question

I am working on a VS2012 solution that has got an ASP.NET MVC 4.0 project and multiple class libraries like my Managers, providers and DataAccess projects. My dbContext class is defined inside the DataAccess project.
My aim is to restrict the connection string info in the DataAccess project's App.Config file. I am trying to avoid specifying the connectionString anywhere else in the project as it is my DataAccess classes that would interact with the DB.
Now if I specify my connection string the my dbContext class by hard coding it, my project works fine and is able to read data from DB.
public MyDbContext()
: base(#"Data Source=MYLAPTOP\SQL2012MAIN;Initial Catalog=MyDB;User ID=sa;Password=*****")
{
}
But if I specify the connection string in app.config file like this:
<connectionStrings>
<add name="MyDBConnection" connectionString="Data Source=MYLAPTOP\SQL2012MAIN;Initial Catalog=MyDB;User ID=sa;Password=*****;Connect Timeout=200; pooling='true" providerName="System.Data.SqlClient" />
</connectionStrings>
and use it in my dbContext classs as follows:
public MyDbContext()
: base("MyDBConnection")
{
}
It doesn't work. I tried using the same connection string in my MVC project's web.config file also, but then again I am getting the same error (attached image):
Can anybody please guide me...
Thanks Hari

Answer 1

I think your fault lies at the pooling, so try
Pooling=True also make sure to remove the single inverted comma that you have, '
There is one more point you might want to research on, I think that Pooling is by default enabled, so setting Pooling=True, while this is explicit, if I remember correctly, it has no effect, whereas Pooling=False does have a effect.

Answer 2

To make it work you can try calling the base constructor like this:
public MyDbContext()
: base("MyDBConnection", backend, metadataSource)
{
}
In this case, backend and metadataSource would be the fields in your MyDbContext class, which hold the configuration of the backend and the configuration of the mapping.
In the Creating OpenAccessContext article, you will find more details about the design of the context.