protected void ddlRestaurant_OnSelectedIndexChanged(object sender, EventArgs e) { var dataManager = new RestaurantManager(); var ddlRestaurant = fvTable.FindControl("ddlRestaurant") as DropDownList; var ddlHall = fvTable.FindControl("ddlHall") as DropDownList; var restaurantId = Convert.ToInt32(ddlRestaurant.SelectedValue); var restaurant = dataManager.GetById(new DataModel.Model.Restaurant(){Id = restaurantId}); ddlHall.DataSource = restaurant.Halls; ddlHall.DataBind(); ShowModal(); }