How to handle MessageSecurityException in validate method of UserNamePasswordValidator in WCF

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WCF

My Validate method:

public override void Validate(string UserName, string Password)
       {

           objAuthenticatication = new Core.Authentication();
           if (!objAuthenticatication.AuthenticateUser(UserName, Password))
           {
               throw new MessageSecurityException("Userid or Password is invalid", new FaultException("The username or password you entered is incorrect."));
               // throw new FaultException("The username or password you entered is incorrect");
               //throw new MessageSecurityException("The username or password you entered is incorrect");
           }
       }

Any exception i throw from service will get unhandled MessageSecurityException in client.

I have thrown commented exception also, but getting same v.

How to Handle this MessageSecurityException in wcf service. and where to handle this.

Thanks.