how to get textbox value inside static method

[WebMethod]
public static UserDetails[] BindDatatable()
{
      //Page page = HttpContext.Current.Handler as Page;
      //TextBox txtBegin = (TextBox)page.FindControl("txtEmail");
      //string s = txtBegin.Text;
      DataTable dt = new DataTable();
      List<userdetails> details = new List<userdetails>();
      string sSql = "EXECUTE dbo.admin_user_sp_update @in_type = 2";
      dt = EasyDBPoolcl.GetDataTable(sSql);
      foreach (DataRow dtrow in dt.Rows)
      {
            UserDetails user = new UserDetails();
            user.Email = dtrow["flag"].ToString();
            details.Add(user);
      }
      return details.ToArray();
}
public class UserDetails
{
      public string UserId { get; set; }
      public string UserName { get; set; }
      public string Location { get; set; }
      public string Email { get; set; }
}