protected void AddNewItemButton_Click(object sender, EventArgs e) { ListManager listManager = new ListManager(); string listId = Request.QueryString["UserListId"]; listManager.AddItemToList(int.Parse(listId), NewItemTitleTextBox.Text); IEnumerable <Item> listItems = listManager.GetListItems(int.Parse(listId)); ListItemsRepeater.DataSource = listItems; ListItemsRepeater.DataBind(); }