Combining interpreted and local queries.

void Main()
{
// This uses a custom 'Pair' extension method, defined below.

IEnumerable<string> q = Customers
.Select (c => c.Name.ToUpper())
.Pair() // Local from this point on.
.OrderBy (n => n);

q.Dump();
}

public static class MyExtensions
{
public static IEnumerable<string> Pair (this IEnumerable<string> source)
{
string firstHalf = null;
foreach (string element in source)
if (firstHalf == null)
firstHalf = element;
else
{
yield return firstHalf + ", " + element;
firstHalf = null;
}
}
}