Concat C# with Example
Merges two collections (without removing duplicates) List foo = new List { 1, 2, 3 }; List bar = new List { 3, 4, 5 }; // Through Enumerable static class var result = Enumerable.Concat(foo, bar).ToList(); // 1,2,3,3,4,5 // Through extension method var result = foo.Concat(bar).ToList(); // 1,2,3,3,4,5