protected void Page_Load(object sender, EventArgs e) { AuthorTBx author = new AuthorTBx(); AuthorManager am = new AuthorManager(); author.Name = Request["name"]; author.Phone = Request["phone"]; author.Desc = Request["desc"]; author.Email = Request["email"]; author.Status = 1; am.AddNew(author); string listcat = Request["listcat"]; List <Author_CategoryTBx> listauthorcat = new List <Author_CategoryTBx>(); Author_CategoryManager acm = new Author_CategoryManager(); for (int i = 0; i < listcat.Split('@').Length - 1; i++) { Author_CategoryTBx authorcat = new Author_CategoryTBx(); authorcat.AuthorID = author.ID; authorcat.CategoryID = Convert.ToInt32(listcat.Split('@')[i]); listauthorcat.Add(authorcat); } acm.AddNew(listauthorcat); }