Change password in AD

[hfleong]

I am trying to change the Active Directory password using C#. However, it seems to me it does not really works. I wonder what is wrong with my code. Hope somene can help me with this and thanks in advance. Below is my code :


try
{
string dcDNS = "mypsptestd ev"; //use this if you want to supply a server name
DirectoryEntry userEntry = null;
string currentUserName = (((string)Conte xt.User.Identit y.Name).Split(' \\')) [1];

DirectoryEntry rootDSE = new DirectoryEntry( String.Format(" LDAP://{0}/rootDSE", dcDNS), "_aduser", "TESTsql@dm 1n", AuthenticationT ypes.Secure);

string rootDN = rootDSE.Propert ies["defaultNamingC ontext"].Value.ToString ();

DirectoryEntry searchRoot = new DirectoryEntry( String.Format(" LDAP://{0}/{1}", dcDNS, rootDN), "_aduser", "TESTsql@dm 1n", AuthenticationT ypes.Secure);

DirectorySearch er searcher = new DirectorySearch er(searchRoot);
searcher.Filter = String.Format(" samAccountName= {0}", "_aduser");
searcher.Search Scope = SearchScope.Sub tree;

SearchResultCol lection results = searcher.FindAl l();

foreach (SearchResult result in results)
{
userEntry = result.GetDirec toryEntry();
break;
}

if (userEntry == null)
{
throw new InvalidOperatio nException("Use r not found in this domain.");
}

userEntry.Invok e("ChangePasswo rd", new object[]{"TESTsql@dm1n" , "sql@dm1n"} );
userEntry.Commi tChanges();
}

catch (System.Reflect ion.TargetInvoc ationException ex)
{
Response.Write( "msg1 = " + ex.ToString() + "<br>");
Response.Write( "msg2 = " + ex.InnerExcepti on.ToString());
}



And this is the error i got :

System.Reflecti on.TargetInvoca tionException: Exception has been thrown by the target of an invocation. ---> System.Runtime. InteropServices .COMException (0x8007202F): A constraint violation occurred. --- End of inner exception stack trace --- at System.RuntimeT ype.InvokeDispM ethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters ) at System.RuntimeT ype.InvokeMembe r(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, ParameterModifi er[] modifiers, CultureInfo culture, String[] namedParameters ) at System.Type.Inv okeMember(Strin g name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args) at System.Director yServices.Direc toryEntry.Invok e(Str ing methodName, Object[] args) at AdminChangePass wd.test.ChangeP assword1() in c:\portal administration\ adminchangepass wd\test.aspx.cs :line 246
System.Runtime. InteropServices .COMException (0x8007202F): A constraint violation occurred.