webmethod not calling in fiddler so ca't get request

While trying to post xml,. I can't get the xml request. I am testing my web method in fiddler tool. what i miss here?

C# Class & WebMethod -

public struct Employee
        {
            public string Name;
            public int Age;
            public float Salary;
        }

    [WebMethod]
    public Employee HelloWorld(Employee emp)
    {
        emp.Name = "Mr " + emp.Name;
        emp.Age += 1;
        emp.Salary += 5000.0f;
        return emp;
    }

XML Request -

<?xml version="1.0" encoding="utf8" ?>
<soap:Envelope xmlns:soap="http://ift.tt/sVJIaE" xmlns:xsi="http://ift.tt/1nHAjlb" xmlns:xsd="http://ift.tt/tphNwY">
    <soap:Body>
        <HelloWorld xmlns="http://ift.tt/14KOGyz">
            <emp>
                       <Name>Bob</Name>
                       <Age>20</Age>
                       <Salary>60000</Salary>
                 </emp>
           </HelloWorld>
      </soap:Body>
</soap:Envelope>

Result in Raw Format -

POST http://localhost:49633/xmlRequest.aspx/HelloWorld HTTP/1.1
User-Agent: Fiddler
Host: localhost:49633
Content-Type: text/xml
Content-Length: 521

   <?xml version="1.0" encoding="utf8" ?>
<soap:Envelope xmlns:soap="http://ift.tt/sVJIaE" xmlns:xsi="http://ift.tt/1nHAjlb" xmlns:xsd="http://ift.tt/tphNwY">
    <soap:Body>
        <HelloWorld xmlns="http://ift.tt/14KOGyz">
            <emp>
                       <Name>Bob</Name>
                       <Age>20</Age>
                       <Salary>60000</Salary>
                 </emp>
           </HelloWorld>
      </soap:Body>
</soap:Envelope>