Ottenere stringa di connessione da App.config e di utilizzarlo in un LINQ DataContext

Question

Come devo estrarre la seguente stringa di connessione e applicarlo al mio contesto Linq? So che la porzione di LINQ, ma sono debole con la sezione System.Configuration.

  <connectionStrings>
        <!-- Production

        <add name="Management_Report_Emailer.Properties.Settings.DWConnectionString"
            connectionString="Data Source=prodSQL01;Initial Catalog=DW;Integrated Security=True"
            providerName="System.Data.SqlClient" />-->


      <!-- QA-->

      <add name="Management_Report_Emailer.Properties.Settings.DWConnectionString"
            connectionString="Data Source=qaSQL01;Initial Catalog=DW;Integrated Security=True"
            providerName="System.Data.SqlClient" />
    </connectionStrings>

Answer 1

ConfigurationManager.ConnectionStrings("Management_Report_Emailer.Properties.Settings.DWConnectionString").ConnectionString

Answer 2

ConfigurationManager.ConnectionStrings["Management_Report_Emailer.Properties.Settings.DWConnectionString"].ConnectionString;