All C# extension methods for type ienumerable-string
Flatten an IEnumerable<string>
Combines an IEnumerable<string> using Path.Combine(), which will use the separator character that is correct for the platform used. It is a shorter and more correct way to combine paths than just using + "\\" + . Requires "using System.IO;" at the top of your extension method class.
Joins a series of strings connected by a separator.