system.io.directory

var filteredFiles = Directory .GetFiles(path, “*.*”) .Where(file => file.ToLower().EndsWith(“aspx”) || file.ToLower().EndsWith(“ascx”)) .ToList(); Edit 2014-07-23 You can do this in .NET 4.5 for a faster enumeration: var filteredFiles = Directory .EnumerateFiles(path) //<— .NET 4.5 .Where(file => file.ToLower().EndsWith(“aspx”) || file.ToLower().EndsWith(“ascx”)) .ToList(); Directory.EnumerateFiles in MSDN