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;
}