c# - Merge two IEnumerables in elegant way -

i have 2 ienumerable variables, both can null. need merge them single list. here direct approach.

var ienumerable1 = getenumerable1();  var ienumerable2 = getenumerable2();   if(ienumerable1 != null){    if(ienumerable2 != null){       return ienumerable1.union(ienumerable2);    }    return ienumerable1; } else{    return ienumerable2; } 

is there more elegant way in less lines of code this?

just check null , assign enumerable.empty if null. can done in 1 step null coalescing operator ??

var ienumerable1 = getenumerable1() ?? enumerable.empty<whatevertype>(); var ienumerable2 = getenumerable2() ?? enumerable.empty<whatevertype>();   return ienumerable1.union(ienumerable2);