Error: The type or namespace name 'localhost' could not be found (are you missing a using directive or an assembly reference?)

Hi Experts,

I'm using visual studio 2012 and just started building my first web service. When I tried to build my website that host a simple web service, I keep getting this error :
Error1 The type or namespace name 'localhost' could not be found (are you missing a using directive or an assembly reference?)      C:\Users\IT\Documents\Visual Studio 2012\WebSites\Temprature\Temprature.aspx.cs      22 9)
and the code snippet that has this error is :

sing System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Temprature : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        localhost.Convert wsConvert = new localhost.Convert();
        double temperature =
        System.Convert.ToDouble(TemperatureTextbox.Text);
        FahrenheitLabel.Text = "Fahrenheit To Celsius = " +
        wsConvert.FahrenheitToCelsius(temperature).ToString();
        CelsiusLabel.Text = "Celsius To Fahrenheit = " +
        wsConvert.CelsiusToFahrenheit(temperature).ToString();
    }
}

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So, please guide me to solve this issue.

Thanks a lot in advance.
Harreni