public static extern bool LookupPrivilegeName(

Declare Function LookupPrivilegeName Lib "advapi32.dll" (TODO) As TODO

LookupPrivilegeName(null, ptrLuid, null, ref luidNameLen); // call once to get the name len

if (LookupPrivilegeName(null, ptrLuid, sb, ref luidNameLen)) // call again to get the name