從App.config獲取連接字符串並在Linq dataContext中使用它

Question

如何提取以下連接字符串並將其應用到我的Linq上下文中？我知道Linq部分，但在System.Configuration部分很弱。

<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;