Bind Dropdown in MVC

view

       @Html.DropDownListFor(model => model.RoleId, (IEnumerable<SelectListItem>)MvcApplicationIntranetApplication.Helpres.GenricHelpers.GetRolesList(), "--Select Roles --", new { @class = "required" })

public static SelectList GetRolesList()
        {
            try
            {
                using (TestDBEntities db = new TestDBEntities())
                {
                    List<Role> roleList = (from roles in db.Roles
                                           //where maritalStatus.Id == MaritalStatusId
                                           select roles).ToList<Role>();
                    //roleList.Insert(0, (new Roles { RoleId = 0, RoleName = "" }));

                    return new SelectList(roleList, "Id", "RoleName");
                }
            }
            catch (SqlException)
            {
                return null;
            }
            catch (EntityException)
            {
                return null;
            }
        }