trying to update all website web.config files of IIS7 at runtimec#. Not getting proper Connectionstring for selected website

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C#

C#4.0

ServerManager mgr = new ServerManager();

foreach (Site s in mgr.Sites)
{


foreach (Application app in s.Applications)
{

foreach (VirtualDirectory virtDir in app.VirtualDirectories)
{



System.Configuration.Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(virtDir.Path);

config.ConnectionStrings.ConnectionStrings["testEntities"].ConnectionString = "server=test;database=test;user id=test;password=test";

config.Save();

ConfigurationManager.RefreshSection("connectionStrings");


}
}