Check of two list have colliding element?

Question

.NET has a number of set operations that work on enumerables, so you could take the set intersection to find members in both lists. Use Any() to find out if the resulting sequence has any entries.

E.g.

if(list1.Intersect(list2).Any()) 

You can always use linq

if (list1.Intersect(list2).Count() > 0) ...

If you're able to use Linq then if(list1.Intersect(list2).Count > 0) {...collision...}.