SQL Cache Dependency

I'm working off of the example shown here:

http://www.c-sharpcorner.com/UploadFile/mosessaur/sqlcachedependency01292006135138PM/sqlcachedependency.aspx?ArticleID=3caa7d32-dce0-44dc-8769-77f8448e76bc

 

The tutorial shows that an entry must be made in web.config for a sqlCacheDependency node in web.config.  When a dependency is added, they set an attributed called "connectionStringName" that references a connectionString established earlier in the web.config.  My question is twofold:

1).  First, I tried setting up my connection string using the connectionStrings node (my other apps use the AppSettings node), but when I try to extract the value in my code using the following syntax:

 connStr = Convert.ToString(System.Configuration.ConfigurationManager.ConnectionStrings["devConnStr"].ConnectionString);

 I get the following compilation error:  "ConfigurationManager does not exist in the class or namespace System.Configuration";

Am I extracting it with the wrong code?  Does that setup exists in .NET v 1.4?  No, I cannot use .NET v 2.0 for various reasons.

 

2).  If I cannot use ConnectionStrings in that way and must use AppSettings, how do I set up SqlCacheDependency node to recognize that connection string?