如何用C#修改文件夹的权限？
NTFS分区中的文件夹权限设置，用C#怎么控制？我不知道.Net有没有提供相关的类。
请高人指点啦。

------解决方案--------------------
DirectorySecurity
------解决方案--------------------
using System;
using System.IO;
using System.Security.AccessControl;

namespace FileSystemExample
{
class DirectoryExample
{
public static void Main()
{
try
{
string DirectoryName = "TestDirectory";

Console.WriteLine("Adding access control entry for " + DirectoryName);

// Add the access control entry to the directory.
AddDirectorySecurity(DirectoryName, @"MYDOMAIN\MyAccount", FileSystemRights.ReadData, AccessControlType.Allow);

Console.WriteLine("Removing access control entry from " + DirectoryName);

// Remove the access control entry from the directory.
RemoveDirectorySecurity(DirectoryName, @"MYDOMAIN\MyAccount", FileSystemRights.ReadData, AccessControlType.Allow);

Console.WriteLine("Done.");
}
catch (Exception e)
{
Console.WriteLine(e);
}

Console.ReadLine();
}

// Adds an ACL entry on the specified directory for the specified account.
public static void AddDirectorySecurity(string FileName, string Account, FileSystemRights Rights, AccessControlType ControlType)
{
// Create a new DirectoryInfo object.
DirectoryInfo dInfo = new DirectoryInfo(FileName);

// Get a DirectorySecurity object that represents the 
// current security settings.
DirectorySecurity dSecurity = dInfo.GetAccessControl();

// Add the FileSystemAccessRule to the security settings. 
dSecurity.AddAccessRule(new FileSystemAccessRule(Account,
Rights,
ControlType));

// Set the new access settings.
dInfo.SetAccessControl(dSecurity);

}

// Removes an ACL entry on the specified directory for the specified account.
public static void RemoveDirectorySecurity(string FileName, string Account, FileSystemRights Rights, AccessControlType ControlType)
{
// Create a new DirectoryInfo object.
DirectoryInfo dInfo = new DirectoryInfo(FileName);

// Get a DirectorySecurity object that represents the 
// current security settings.
DirectorySecurity dSecurity = dInfo.GetAccessControl();

// Add the FileSystemAccessRule to the security settings. 
dSecurity.RemoveAccessRule(new FileSystemAccessRule(Account,
Rights,
ControlType));

// Set the new access settings.
dInfo.SetAccessControl(dSecurity);

}
}
}