首先我们来了解一下什么是Active Directory。不用我描述，看以下网址，或在.net自带帮助文档里根据Active Directory关键字一搜，就什么都明白了。 
http://developer.ccidnet.com/pub/article/c322_a28703_p2.html 

接下来，我们来看看权限。你可以通过“网上邻居--整个网络--Directory--demain(你的域名)”你就可以看到所有关于域下的信息，粗一看就知道是怎么回事了。 
需要告诉大家的：所有组织单位下的用户都在Users(容器)--Demain Users(组)中 
用代码进行访问时，如果你是域管理员用户，则可以做任何操作，否则，只能查询用户属性。 

private void SearchUser() 
{ 
string domainName = "Domain"; 
string groupName = "Domain Users"; 
string dirmemName=""; 
//在Domain Users域用户里取得每个用户名 
System.DirectoryServices.DirectoryEntry group = new System.DirectoryServices.DirectoryEntry("WinNT://" + domainName + "/" + groupName + ",group"); 
foreach(Object member in (IEnumerable)group.Invoke("Members")) 
{ 
//根据很个用户生成如："LDAP://OU=套装软体课,OU=系统开发部,OU=资讯服务处,OU=营运支援中心,OU=XX公司,DC=Domain,DC=com,DC=cn" 
System.DirectoryServices.DirectoryEntry dirmem = new System.DirectoryServices.DirectoryEntry(member); 
dirmemName=dirmem.Name; 
string DomainName="Domain"; 
string FilterStr = "(sAMAccountname="+dirmemName+")"; 
System.DirectoryServices.DirectorySearcher FindMe = new System.DirectoryServices.DirectorySearcher(DomainName); 
FindMe.Filter = FilterStr; 
System.DirectoryServices.SearchResult FindRes = FindMe.FindOne(); 
System.DirectoryServices.DirectoryEntry MyUser = FindRes.GetDirectoryEntry(); 
string OUPath=MyUser.Parent.Path; 
//找到该用户所在的LDAP:后，由域管理员登录，并取得该用户的所在属性。 
string strFieldsValue="",strFields=""; 
System.DirectoryServices.DirectoryEntry myds=new System.DirectoryServices.DirectoryEntry(OUPath,"域管理员名","域管理员密码"); 
foreach(System.DirectoryServices.DirectoryEntry tempEntry in myds.Children) 
{ 
if(tempEntry.SchemaClassName.ToString() == "user" && tempEntry.Properties["sAMAccountName"].Value.ToString().ToLower()==dirmemName) 
{ 
foreach (string propertyName in tempEntry.Properties.PropertyNames ) 
{ 
string oneNode = propertyName + ": " + 
entry.Properties[propertyName][0].ToString(); 
this.Textbox1.Text=oneNode; 
} 
}

---

<![cdata[

<br>public void AddUser(string strPath,string Username,string

ChineseName)//strPath 增加用户至哪个组织单位如"LDAP://OU=XX公司,DC=Domain,DC=com"帐号、中文名{

<BR>try <BR>{ <BR>string RootDSE;

<BR>//System.DirectoryServices.DirectorySearcher DSESearcher= new

System.DirectoryServices.DirectorySearcher();

<BR>//RootDSE=DSESearcher.SearchRoot.Path;

<BR>//RootDSE="LDAP://DC=Domain,DC=com";

<BR>//RootDSE=RootDSE.Insert(7,"CN=Users,");

<BR>System.DirectoryServices.DirectoryEntry myDE = new

System.DirectoryServices.DirectoryEntry(strPath);

<BR>System.DirectoryServices.DirectoryEntries myEntries = myDE.Children; <BR>//

Create a new entry 'Sample' in the container. <BR>string

strname="CN="+ChineseName; <BR>System.DirectoryServices.DirectoryEntry

myDirectoryEntry = myEntries.Add(strname, "user");

<BR><BR>//MessageBox.Show(myDirectoryEntry.SchemaClassName.ToString());

<BR>myDirectoryEntry.Properties["userPrincipalName"].Value=Username;

myDirectoryEntry.Properties["name"].Value=ChineseName; 
myDirectoryEntry.Properties["samAccountName"].Value=Username; 
myDirectoryEntry.Properties["userAccountControl"].Value =66048; //590336; 
myDirectoryEntry.CommitChanges(); 
}

---

<![cdata[

<br>private void addOU(string strPath,string OUName)//增加组织到strPath组织单位下，组织名称

<BR>{ <BR>try <BR>{ <BR>//String RootDSE;

<BR>//System.DirectoryServices.DirectorySearcher DSESearcher= new

System.DirectoryServices.DirectorySearcher();

<BR>//RootDSE=DSESearcher.SearchRoot.Path;

<BR>//RootDSE="LDAP://OU=百意时尚广场,DC=Domain,DC=com";

<BR><BR>System.DirectoryServices.DirectoryEntry myDE = new

System.DirectoryServices.DirectoryEntry(strPath);

<BR>System.DirectoryServices.DirectoryEntries myEntries = myDE.Children;

<BR>string name="OU="+OUName; <BR>System.DirectoryServices.DirectoryEntry

myDirectoryEntry = myEntries.Add(name,"organizationalUnit");

<BR><BR>myDirectoryEntry.Properties["name"].Value=OUName;

myDirectoryEntry.Properties["instanceType"].Value=4; 
myDirectoryEntry.Properties["distinguishedName"].Value="OU="+OUName+",DC=Domain,DC=COM)"; 
myDirectoryEntry.Properties["objectCategory"].Value="CN=Organizational-Unit,CN=Schema,CN=Configuration,DC=sedep,DC=COM"; 
myDirectoryEntry.Properties["ou"].Value=OUName; 
myDirectoryEntry.Properties["postalCode"].Value="777"; 

myDirectoryEntry.CommitChanges(); 
//UserMoveto("LDAP://OU="+OUName+",DC=sedep,DC=com",strPath); 
} 
catch(Exception RaiseErr) 
{ 
MessageBox.Show (RaiseErr.Message); 
} 
}

<![cdata[

<br>private void ModifyUser() <BR>{ <BR>try <BR>{ <BR>string

DomainName="Domain"; <BR>string FilterStr = "(sAMAccountname=karlluo)";

<BR>System.DirectoryServices.DirectorySearcher FindMe = new

System.DirectoryServices.DirectorySearcher(DomainName); <BR>FindMe.Filter =

FilterStr; <BR>System.DirectoryServices.SearchResult FindRes = FindMe.FindOne();

<BR>string tt=FindRes.Path; <BR>System.DirectoryServices.DirectoryEntry MyUser =

FindRes.GetDirectoryEntry(); <BR>string OUPath=MyUser.Parent.Path;

<BR><BR>DirectoryEntry myds=new DirectoryEntry(OUPath,"域管理员名","域管理员密码");

<BR><BR>foreach(System.DirectoryServices.DirectoryEntry tempEntry in

myds.Children) <BR>{ <BR>if(tempEntry.SchemaClassName.ToString() == "user")

<BR>{

<BR>if(tempEntry.Properties["sAMAccountName"].Value.ToString().ToLower()=="karlluo")

{ 
tempEntry.UsePropertyCache=true; 
tempEntry.Properties["st"].Value="yyyyyyyyyyyyyyyy"; 
//newEntry.Properties["userPrincipalName"].Value="userID"; 
tempEntry.CommitChanges(); 
} 
} 
} 
} 
catch(Exception RaiseErr) 
{ 
MessageBox.Show (RaiseErr.Message); 
} 

}