What's the most efficient way to combine two List(Of String)?

Let's say I've got:

Dim los1 as New List(Of String)
los1.Add("Some value")

Dim los2 as New List(Of String)
los2.Add("More values")

What would be the most efficient way to combine the two into a single `List(Of String)`?

**Edit**: While I love the solutions everyone has provided, I probably should have also mentioned I'm stuck using the .NET 2.0 framework.

Union() potentially, if you want a distinct list of entries (I beleive it only does a distinct), is another alternative.

I think

los1.AddRange(los2)

JaredPar's answer will give you an object that will enumerate over both lists. If you actually want a `List(Of String)` object **containing** these values, it's as simple as:

Dim combined As New List(Of String)(los1.Concat(los2));

**EDIT**: You know, just because you're using .NET 2.0 doesn't mean you can't roll your own versions of some of the LINQ extension methods you personally find useful. The `Concat` method in particular would be quite trivial to implement in C#\*:

public static class EnumerableUtils {
public static IEnumerable<T> Concat<T>(IEnumerable<T> first, IEnumerable<T> second) {
foreach (T item in first)
yield return item;

foreach (T item in second)
yield return item;
}
}

Then, see here:

Dim los1 as New List(Of String)
los1.Add("Some value")

Dim los2 as New List(Of String)
los2.Add("More values")

Dim combined As New List(Of String)(EnumerableUtils.Concat(los2, los2))

\* <sub>To be fair, this is a lot more straightforward in C# thanks to the `yield` keyword. It *could* be done in VB.NET, but it'd be trickier to provide deferred execution in the same manner that the LINQ extensions do.</sub>

If you just want to see a sequence of the two lists then use the `Enumerable.Concat` method.

Dim combined = los1.Concat(los2)

This will return an `IEnemurable(Of String)` which contains all of the elements in `los1` and `los2`. It won't allocate a huge new collection but instead will iterate over the 2 separate collections.