How to get ASP controls value inside static WebMethod in ASP.Net

Hi 

   I have a label which is inside a gridview.I want the label value inside the static method.

   Here is my code

 [System.Web.Services.WebMethod]
 
    public static string seat(string SeatNum)
    {
        if (HttpContext.Current != null)
        {
            Page page = (Page)HttpContext.Current.Handler as Page;
            Label lblSeatNum = (Label)page.FindControl("lblSeatNo");
            lblSeatNum.Text=SeatNum.ToString();
            Label lblfare = (Label)page.FindControl("lblTotfare");
            GridView grd = (GridView)page.FindControl("rptrbus");
            foreach (GridViewRow row in grd.Rows)
            {
                Label lblgrdfare = (Label)row.FindControl("lbFare");
                lblfare.Text = lblgrdfare.Text;
            }  

        }
            int dt=0;
        return dt.ToString();
    }