Error while adding the WCF service

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WCF

Hi All,
I am a beginner in WCF, So please help me out. There is no IIS installed on my system.
So using Asp.net Web Development server.

This is my MathService.Svc file

<%@ ServiceHost Language="C#" Debug="true" Service="MathService" CodeBehind="~/App_Code/MathService.cs" %>

IMathService.cs  file which is the interface code
[ServiceContract]
public interface IMathService
{
    [OperationContract]
    int Add(int a, int b);

}

This is my MathService.cs code

public class Service : IMathService
{

    public int Add(int a, int b)
    {
        return a + b;
    }
}

When i try to add this service to a console application, i get the below error

<br />
The type 'MathService', provided as the Service attribute value in the ServiceHost directive could not be found.<br />
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.<br />
Exception Details: System.InvalidOperationException: The type 'MathService', provided as the Service attribute value in the ServiceHost directive could not be found.

In the Web.config file I have changed the config file as

<system.serviceModel>
        <services>
            <service name="MathService" behaviorConfiguration="ServiceBehavior">
                <!-- Service Endpoints -->
                <endpoint address="" binding="wsHttpBinding" contract="IMathService">
                    <!--
              Upon deployment, the following identity element should be removed or replaced to reflect the
              identity under which the deployed service runs.  If removed, WCF will infer an appropriate identity
              automatically.
          -->
                    <identity>
                        <dns value="localhost"/>
                    </identity>
                </endpoint>
                <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
            </service>
        </services>
        <behaviors>
            <serviceBehaviors>
                <behavior name="ServiceBehavior">
                    <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
                    <serviceMetadata httpGetEnabled="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>
        </behaviors>
    </system.serviceModel>

Please let me know what is this error popping up.
I am using .Net framework 3.5 and VS 2010.

When i try to run the Default service i.e. Service.Svc it works fine.