Question

I have a web project (mvc) and data access layer in a separated class library project. I need to access to a connection string in app.config which sits in that library project.

ConfigurationManager.ConnectionStrings[0].ConnectionString pulls something strange. I don’t have this kind of settings neither in the library’s config nor in the web project’s config files.

the App.config looks like that:

<?xml version="1.0" encoding="utf-8" ?>
 <configuration>
  <connectionStrings>
   <add name="DALConnectionString" connectionString="User ID=sa;Password=pass;Initial     Catalog=db;Data Source=srv\SQL2005;" />
 </connectionStrings>
</configuration>

Answer 1

By default, a class library can’t access a config file.

The client of the class library, in this case your web project, can provide config settings.

Therefore, put all the relevant settings, the connection strings, in the web’s config file. The ConfigurationManager code in the class library will use the web projects config settings.