public void LoadData() { OnLineUserList.Clear(); systemManageDomainContext = new SystemManageDomainContext(); LoadOperation <ProductManager.Web.Model.user> loadOnLineUser = systemManageDomainContext.Load <ProductManager.Web.Model.user>(systemManageDomainContext.GetLogonUserQuery()); loadOnLineUser.Completed += loadOperationloadOnLineUser_Completed; }