Changing Password

I am also using similar code as mentioned in the directoryprogramming.net site

DirectoryEntry entry = new DirectoryEntry("LDAP://Server", domainAndUsername, "Password", AuthenticationTypes.Secure);
DirectorySearcher mySearcher = new DirectorySearcher(entry);
SearchResult searchResult = mySearcher.FindOne();
if (searchResult != null)
{
entry.Invoke("ChangePassword", new object[] { "Password", "NewPassword" });
entry.CommitChanges();
}

Check it out:
http://directoryprogramming.net/forums/thread/1692.aspx

I am using the following code

entry.Invoke("ChangePassword", new object[] { "admin#123", "admin@123" });

Is this not right?