Add HTTP GET method to C# web service

In your Web.config:

<configuration>
    <system.web>
        <webServices>
            <protocols>
                <add name="HttpGet"/>
            </protocols>
        </webServices>
    </system.web>
</configuration>

referer: http://stackoverflow.com/questions/1140028/add-http-get-method-to-c-web-service