Help!!Can Add user to Active Directory, but can Not update

[faithful1]

Well, this is very strange to me. I can add a user to Active directory via a custom component. However, I can not update an existing user. This code is part of a component I am writing. I get the unknown error at the line
**user.Properties["description"].Add("New description");


public void UpdateMe()
{
string path = "LDAP://10.xxx.xxx.x";
DirectoryEntry entry = new DirectoryEntry
path,"\\Administrator","password");
DirectorySearcher search = new DirectorySearcher(entry);
search.Filter = "(SAMAccountName=Test User)";
SearchResult result = search.FindOne();
DirectoryEntry user = result.GetDirectoryEntry();
user.Properties["description"].Add("New description");
user.Properties["givenName"].Value = "New Name";
user.CommitChanges();
entry.Close();
}

 

[GMX]

Maybe try to copy the user you want to modify, modify the user object, remove the old one, add the modified one.

 

[faithful1]

GMX-
Thanks for your response!
I found another way- populating the Directory Entry differently. It works. I still don't understand why the first one didn't work.

string path = "LDAP://10.xxx.xxx.x";
DirectoryEntry entry = new DirectoryEntry
path,"\\Administrator","password");

DirectorySearcher search = new DirectorySearcher(entry);
//I am using an emp id number for user SAMAccountName, so I will search for SAMAccountName and grab 'cn' to update.
search.Filter = "(SAMAccountName=999999)";
SearchResult result = search.FindOne();
//from result, grab the "cn" name
name="cn=" + result.Properties["cn"][0].ToString();
//Make sure the user is in the User group
DirectoryEntry group = entry.Children.Find("CN=Users");
//Look for a child in this group w/ "cn" name found
DirectoryEntry user = group.Children.Find(name,"user");
//once user is found,update it
if (result.Properties.Contains("telephoneNumber"))
{user.Properties["telephoneNumber"].Value =(dr["varFaxNumber"]);}
else
{user.Properties["telephoneNumber"].Add(dr["varPhoneNumber"]);}