Create Documentset programmatically in Sharepoint 2010

using (SPSite siteCollectionOuter = new SPSite(sSiteName))

{

   using (SPWeb site = siteCollectionOuter.OpenWeb())

{

site.AllowUnsafeUpdates = true;

SPList WorkingDocslist = site.Lists["Working Documents"];

SPFolder folderToInsertIn = WorkingDocslist.RootFolder;

//Get the content type ID for the specified document set content type.

SPContentTypeId dsCtId = new SPContentTypeId();

// Create the Document Set Properties HashTable

Hashtable properties = new Hashtable();

properties.Add("Project_x0020_Name", site.Title);

properties.Add("OPSCustomProjectID", sProjectID);

properties.Add("OPSTaskID", sTaskID);

properties.Add("DSType", sDocumentSetType);

properties.Add("DocumentSetDescription ");

properties.Add("DocumentSetVersion", "0.0");

properties.Add("CreatedBy", SPContext.Current.Web.CurrentUser.Name);

properties.Add("ModifiedBy", SPContext.Current.Web.CurrentUser.Name);

DocumentSet docset = null;

if (isTrue)

{

docset = DocumentSet.Create(folderToInsertIn, strDocSetName, dsCtId, properties, true);

}

       }

}