// Create a connectionn string element and add it to
       // the connection strings section.
       static ConnectionStrings()
       {
           // Get the application configuration file.
           System.Configuration.Configuration config =
                   ConfigurationManager.OpenExeConfiguration(
                   ConfigurationUserLevel.None);

           // Get the current connection strings count.
           int connStrCnt = 
               ConfigurationManager.ConnectionStrings.Count;

           // Create the connection string name. 
           string csName = 
               "ConnStr" + connStrCnt.ToString();

           // Create a connection string element and
           // save it to the configuration file.
          
           // Create a connection string element.
           ConnectionStringSettings csSettings =
                   new ConnectionStringSettings(csName,
                   "LocalSqlServer: data source=127.0.0.1;Integrated Security=SSPI;" +
                   "Initial Catalog=aspnetdb", "System.Data.SqlClient");

           // Get the connection strings section.
           ConnectionStringsSection csSection =
               config.ConnectionStrings;

           // Add the new element.
           csSection.ConnectionStrings.Add(csSettings);
               
           // Save the configuration file.
           config.Save(ConfigurationSaveMode.Modified);
       }