How do I Get with using string parameter?

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LINQ

MVC

EF6.0

Hi,

I currently have a web api Get method using EF6 and it is accepting an int parameter called serial. Instead of the primary key serial I want to find extserial from the URI.

Here is my Get where I have localhost/api/AH?serial=1

// GET api/AH/5
[ResponseType(typeof(Transmital))]
public IHttpActionResult GetTransmital(int Serial)
{
    Transmital transmital = db.Transmitals.Find(Serial);
    if (transmital == null)
    {
        return NotFound();
    }

    return Ok(transmital);
}

I need to have it get by localhost/api/AH?ExtSerial=ABC123

For some reason it won't take the following

// GET api/AH/5
        [ResponseType(typeof(Transmital))]
        public IHttpActionResult GetTransmital(string ExtSerial) //or [FromUri]string ExtSerial
        {
            Transmital transmital = db.Transmitals.Find(ExtSerial);
            if (transmital == null)
            {
                return NotFound();
            }

            return Ok(transmital);
        }