rest method that can support request/responce in both xml and json formats

Hi,
I want  to create rest method that can support request/responce in both xml and json formats.



I am trying in bellow way, but its not working getting error.
any idea on this?

Code in IService.cs :

[OperationContract]       
[WebGet(UriTemplate = "/Login/{UserID}/{Password}")]
Responce Login(string UserID, string Password);

Code in Service.cs :

public Responce Login(string UserID, string Password)
        {
            try
            {
                objResponce = new Responce();
                objResponce.MessageType = Responce.ResponceType.Warning.ToString();
                string Con = GetConnectionString(UserID, Password);  //Method to check valid user or not
                if (Con.Trim().Length != 0)            
                    objResponce.Message = "you have logged in Successfully";                   
                else
                    objResponce.Message = "Please Enter Valid UserID,Password";                
             
            }
            catch (Exception ex)
            {
                through ex;             
            }
            return objResponce;
        }

My Config settings :
<services>
      <service name="OnePointAPI.OnePointAPIService">
           <endpoint address="JSON" binding="webHttpBinding" contract="OnePointAPI.IOnePointAPIService" behaviorConfiguration="webJSON" ></endpoint>
           <endpoint address="XML" binding="basicHttpBinding" contract="OnePointAPI.IOnePointAPIService" behaviorConfiguration="webXML" ></endpoint>     
      </service>   
 </services>
 <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- 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"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="webJSON">
          <webHttp defaultOutgoingResponseFormat="Json"/>
        </behavior>
        <behavior name="webXML">
          <webHttp defaultOutgoingResponseFormat="Xml" />
        </behavior>
      </endpointBehaviors>
 </behaviors>  

---

Anwar Shaik