Concat HashSet<String> and IList<String>

Question

I have a hash set as :

HashSet<String> hash ;

and a list as:

IList<String> names = new List<String>(){"ABC","DEF"};

I want to concat hash and names; then store the result in same variable i.e. hash.

What is the best approach to do this since I have arround 10k records to store in HashSet?

Answer 1

Use UnionWith:

Modifies the current HashSet object to contain all elements that are present in itself, the specified collection, or both.

hash.UnionWith(names);