//OLD VERSION
var GUIs;
var VMs;
if (activeIsSelected) {
  GUIs = (from g in db.GUILicenseGrants
          where g.Grant_History.Job_ID == VMJob.ID
          && g.Grant_History.Hardware_Assoc != null
          select g).ToList();

  VMs = (from n in db.NodeLicenseGrants
         where n.Grant_History.Job_ID == VMJob.ID
         && n.Grant_History.Hardware_Assoc != null
         select n).ToList();
}
else {
  GUIs = (from g in db.GUILicenseGrants
          where g.Grant_History.Job_ID == VMJob.ID
          && g.Grant_History.Hardware_Assoc == null
          select g).ToList();

  VMs = (from n in db.NodeLicenseGrants
         where n.Grant_History.Job_ID == VMJob.ID
         && n.Grant_History.Hardware_Assoc == null
         select n).ToList();
}

//NEW VERSION
var GUIs = (from g in db.GUILicenseGrants
            where g.Grant_History.Job_ID == VMJob.ID
            && !(activeIsSelected ^ g.Grant_History.Hardware_Assoc != null)
            select g).ToList();

var VMs = (from n in db.NodeLicenseGrants
            where n.Grant_History.Job_ID == VMJob.ID
            && !(activeIsSelected ^ n.Grant_History.Hardware_Assoc != null)
          select n).ToList();