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I've built an project which can get the ActiveDirectory user's data .

I had 4 values to get the information :
4.DomainExtension(like com,local,..)
and the company's computers are under WORKGROUP and they just connect to AD server to get the user's info.

this is my code for getting info:



String Path = "LDAP:// " + DomainName + "." + DomainExt + "/DC=" + DomainName + ",DC=" + DomainExt;

DirectoryEntry Entry = new DirectoryEntry(Path, DomainName + @"\" + Username, Password);
DirectorySearcher search = new DirectorySearcher(Entry);
search.Filter = String.Format("(SAMAccountName={0})", Username);
SearchResult result = search.FindOne();

Value = (string)result.Properties["sn"][0];


catch (Exception ex)
return ex.Message;

And I've done this successfully at my office local network ... but when I tested it at the company I've got this error :
Logon failure: unknown user name or bad password.
on this <<SearchResult result = search.FindOne();>>
and they can get the user's info with this username and password with some other program .. so there isn't anything wrong with the username and password ..
and I really don't know how to fix it ...
Updated 5-Dec-14 21:51pm

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