ADO.NET :: Linq And Webservices / Create A Webservice Method Using LINQ Technology And To Populate A Dropdown In a Form?

I am struggling to create a webservice method using LINQ technology and to populate a dropdown in a form. Here is the Webservice code.

[WebMethod]

public
string[] GetAllCountries()
{
LinqClassesDataContext db =
new
LinqClassesDataContext();
var q =
from c
in db.ListContinents()select
c;
return q.ToList() ;
}

And here is the form code behind

protectedvoid
Page_Load(object sender,
EventArgs e)
{
WSClass WS =
new
WSClass();//bool
ds = WS.GetAllCountries();
var v = WS.GetAllCountries();
ddlContinent.DataSource = v;
ddlContinent.DataBind();
}