/// <summary>
/// Updates the web.cloud.config with to auto-discover the cache role.
/// </summary>
/// <param name="roleName">The role name</param>
/// <param name="cacheWorkerRoleName">The cache worker role name</param>
/// <param name="azureService">The azure service instance for the role</param>
private void UpdateWebConfig(string roleName, string cacheWorkerRoleName, string webConfigPath)
{
XDocument webConfig = XDocument.Load(webConfigPath);
Dictionary <string, object> parameters = new Dictionary <string, object>();
parameters[ScaffoldParams.RoleName] = cacheWorkerRoleName;
string autoDiscoveryConfig = Scaffold.ReplaceParameter(Resources.CacheAutoDiscoveryConfig, parameters);
// Adding the auto-discovery is sensetive to the placement of the nodes. The first node which is <configSections>
// must be added at the first and the last node which is dataCacheClients must be added as last element.
XElement autoDiscoverXElement = XElement.Parse(autoDiscoveryConfig);
webConfig.Element("configuration").AddFirst(autoDiscoverXElement.FirstNode);
webConfig.Element("configuration").Add(autoDiscoverXElement.LastNode);
Debug.Assert(webConfig.Element("configuration").FirstNode.Ancestors("section").Attributes("name") != null);
Debug.Assert(webConfig.Element("configuration").LastNode.Ancestors("tracing").Attributes("sinkType") != null);
webConfig.Save(webConfigPath);
}