How to change user password in a .NET application

[Yannick Béot]

Hi,

I'm trying to make an application that allow a user, through a web form
to change its password

On a click event, here is the code

DirectoryEntry usr = new DirectoryEntry(
theUserDN,
user,
password, AuthenticationT ypes.Secure);
usr.Invoke(
"ChangePassword ",
new object[]{password, newpassword} );

where password is the current user password
newpassword... the new password
user, the login
theUserDn, something like
"LDAP://mydomaincontrol ler/CN=...,cn=users ,DC=superheros, DC=com"
I have got an exception :

[COMException (0x8007202f): Une violation de contrainte s'est produite.]

[TargetInvocatio nException: Une exception a été levée par la cible d'un
appel.]
System.RuntimeT ype.InvokeDispM ethod(String name, BindingFlags
invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers,
Int32 culture, String[] namedParameters ) +0
System.RuntimeT ype.InvokeMembe r(String name, BindingFlags
invokeAttr, Binder binder, Object target, Object[] args,
ParameterModifi er[] modifiers, CultureInfo culture, String[]
namedParameters ) +473
System.Type.Inv okeMember(Strin g name, BindingFlags invokeAttr,
Binder binder, Object target, Object[] args) +29
System.Director yServices.Direc toryEntry.Invok e(String methodName,
Object[] args) +107
clarins.u1_1.Bu tton1_Click(Obj ect sender, EventArgs e) +108
System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e) +108

System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP ostBackEvent(St ring
eventArgument) +57
System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument) +18
System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection postData) +33
System.Web.UI.P age.ProcessRequ estMain() +1277

Do you have any idea?