Add data to existing list using lambda exp

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ASP.NET

MVC4

i have list of user with time.
i give orderby on time.

now i want to append one more record at first position.but it add at last of list.

What I have tried:

selectedusr = roomList.Where(x => x.Username == hdnRoomName.Value).FirstOrDefault();

roomListtemp = roomList.OrderByDescending(x => x.UpdatedAt).Take(9).ToList();  
             
roomListtemp.Add(selectedusr);

now new roomlisttemp have add new value at last but i want it requried at 1st potion.