Make Document Set using infopath code in sharepoint 2010.

1.First create one Document Library and go to library sittings.
2.Open Advanced setting, then click "Yes" Allow management of centent types.
3.then Add from existing site content types , select Document Set.
4.Go to Infopath 2010, add one check box write code one change event in check box.

            XPathNavigator myRootNode = MainDataSource.CreateNavigator();
             myRootNode.SelectSingleNode(" /my:myFields/my:field4", NamespaceManager).SetValue("rintu");
            try
            {
               
                SPWeb web = SPContext.Current.Web;
                myRootNode.SelectSingleNode(" /my:myFields/my:field4", NamespaceManager).SetValue(web.Url.ToString());
                SPList list = web.Lists["BriefingDoc"];
                string sguid = System.Guid.NewGuid().ToString();
                web.AllowUnsafeUpdates = true;
                string sDocsetName = string.Empty;
                sDocsetName = "Document Set";
                DocumentSet ds = DocumentSet.Create(list.RootFolder, sguid, list.ContentTypes[sDocsetName].Id, null, true);
                web.AllowUnsafeUpdates = false;
                string DocUrl = ds.WelcomePageUrl.Replace("Document Set", "Document%20Set");
                myRootNode.SelectSingleNode("/my:myFields/my:field2/@my:field3", NamespaceManager).SetValue(DocUrl);

            }
            catch (Exception ex)
            {
                myRootNode.SelectSingleNode("/my:myFields/my:DatadeTérminoMessage", NamespaceManager).SetValue(ex.Message);
            }
            }

5.see that one hyper link is created, click that and upload the documents.