HTTPS authentication in wcf restful Service

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ASP.NET

C#3.5

webservice

, +

Hi,

I have started with wcf web service & i am stuck with something.Scenario is like i have a https wsdl file which is authenticated with a password & username.It has 3 parts Contract,implementation & service.In implementation i am adding up the service reference and the app.config gets changed according to that having basichttpwinding.

As the wsdl file is authenticated i would have to pass username & password.So i have done that.

DCService.DCClient cli = new DCService.DCClient(bind, ep);
  //pass custom credentials
  cli.ClientCredentials.UserName.UserName = "Arvind";
  cli.ClientCredentials.UserName.Password = "Silver";

Now do i need to create another authentication solution containg class for usernamepasswordvalidator????
Which binding shall i use basic httpbinding or wshttpbinding and what about the

<security mode="TransportWithMessageCredential">

<message clientCredentialType="UserName"/>

One more thing when i add the service reference as we know app.config changes automatically specially the binding part.It shows two bindings in one binding the the security mode = "transport credentials" & in other binding security binding =none .
I know these questions could be very lame but have gone through some articles but these doubts remain.