это первокласники знают)
var names = project.Lists["names"];
System.IO.DirectoryInfo directory = new System.IO.DirectoryInfo(project.Variables["path"].Value);
foreach(System.IO.DirectoryInfo subDirectory in directory.GetDirectories())
names.Add(subDirectory.Name);
string dirName = "Z:\\";
string[] dirs = Directory.GetDirectories(dirName);
project.Variables["asdf"].Value = string.Join("\r\n", dirs);
string[] files = Directory.GetFiles(dirName);
project.Variables["qwer"].Value = string.Join("\r\n", files);


