C# 修改資料夾或檔案的隱藏屬性

// 隱藏檔案
String strFileName = @"C:\test.txt";
FileInfo fileInfo = new FileInfo(strFileName);
fileInfo.Attributes = FileAttributes.Hidden;

// 隱藏資料夾
String strDirName = @"C:\test";
DirectoryInfo diMyDir = new DirectoryInfo(strDirName);
diMyDir.Attributes = FileAttributes.Hidden;

Ref:  http://msdn.microsoft.com/zh-tw/library/system.io.filesysteminfo.attributes.aspx