How Do I Authenticate Wcf Service Using Customusernamevalidator : Usernamepasswordvalidator ?

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C#5.0

WCFServices

Hi Friends,
I have to authenticate my wcf service using CustomUserNameValidator, but its never gettinbg hit .

Please look at my below code.

//Client Side

RESTSVCClient oClient = new RESTSVCClient();

oClient.ClientCredentials.UserName.Password = "Suresh";
 oClient.ClientCredentials.UserName.Password = "12345";

//In WCF Service I have a class as below

public class CustomUserNameValidator : UserNamePasswordValidator
   {
       public override void Validate(string userName, string password)
       {
           if (null == userName || null == password)
           {
               throw new ArgumentNullException();
           }

           if (!(userName == "suresh" && password == "12345"))
           {
               throw new FaultException("Unknown Username or Incorrect Password");

           }
       }
   }

In WCF Web.config

<security mode="Message">
            <message clientCredentialType="UserName" />
</security>

<behavior name="ServiceBehaviour">
         <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
         <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
         <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
         <serviceDebug includeExceptionDetailInFaults="false"/>
         <serviceCredentials>
           <userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="RESTFULLSVC.CustomUserNameValidator,RESTFULLSVC"/>
         </serviceCredentials>
</behavior>

Pls advice , how do i fire the Validate(string userName, string password) ?