change password for active directory user

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C#

directory

when i am try to change password to an active directory user using the following code i am getting the the exception


//string OldPassword, string NewPassword)

try
{
entry.Invoke("ChangePassword", object[] password);
entry.CommitChanges();
}


Configuration information could not be read from the domain controller, either because the machine is unavailable, or access has been denied