CloseSolutionElement syntax incorrect on MSDN

None of the code below is working for me to explicitly close a solution while load, 
I am trying to do it in IVsSolutionLoadManager implementation.
Also syntax to close entire solution is incorrect.  I tried using below and that did not work.
solution.CloseSolutionElement(0, null, 0);
I am currently trying both of below and none worked.
string directory, fileName, options;                solution.GetSolutionInfo(out directory, out fileName, out options);                solution.CloseSolutionElement((uint)__VSSLNCLOSEOPTIONS.SLNCLOSEOPT_SLNSAVEOPT_MASK | (uint)__VSSLNSAVEOPTIONS.SLNSAVEOPT_NoSave, null, 0);
 ------------------------------------------------------------------                var dte = GetGlobalService(typeof(DTE)) asDTE;                if (dte == null)                {                    thrownewNullReferenceException("could not get DTE");                }                dte.Solution.Close();