c# - How to search through multiple sets with one linq statement -

consider 3 different lists of strings, 1 of list of lists. need search them find particular one.

in sample, result achieved, in 1 linq statement. note not want change existing collections, nor create new ones.

        var collectiona = new list<string>() {"item1", "item2"};         var collectionb = new list<string>() { "item3", "item4" };         var listoflists = new list<list<string>>() {new list<string>() {"item5", "item6"}, new list<string>(){ "item7", "item8"}};          //is there better linq way this?         var searchstring = "item5";         var item = collectiona.firstordefault(i => == searchstring);         if (item == null)         {             item = collectionb.firstordefault(i => == searchstring);             if (item == null)             {                 foreach (var listoflist in listoflists)                 {                     item = listoflist.firstordefault(i => == searchstring);                     if (item != null)                     {                         break;                     }                 }             }         } 

bool result = listoflists.selectmany(x => x)                          .concat(collectiona)                          .concat(collectionb)                          .any(x => x == "item5");