private void Button2_Click(object sender, EventArgs e) { // save vào database String FullName, Phone, Email, IdUser; DataTable dtItem = (DataTable)(dgItems.DataSource); foreach (DataRow dr in dtItem.Rows) { ContactModel ctselect = new ContactModel(); FullName = Convert.ToString(dr["FullName"]); Phone = Convert.ToString(dr["Phone"]); Email = Convert.ToString(dr["Email"]); var db = new ContactsContext(); if (FullName != null && Phone != null && Email != null && FullName != "" && Phone != "" && Email != "") { ctselect.FullName = FullName; ctselect.Phone = int.Parse(Phone); ctselect.Email = Email; ctselect.IdUser = frmContact.idUser; ContactController.CheckImp(ctselect); } } MessageBox.Show("Đã Lưu vào DataBase !!"); dgItems.DataSource = null; dataGridView1.DataSource = dgItems; frmContact.Update_tableContact(); }