private void loginBtn_Click(object sender, EventArgs e) { QuanLyKaraokeDB db = new QuanLyKaraokeDB(); var row = db.GetData($"select * from NHANVIEN where tenDN='{usernameTxt.Text.ToString()}' and matKhau='{passTxt.Text.ToString()}'").Rows; if (row.Count == 1) { string username = row[0].ItemArray[0].ToString(); bool isManager = Convert.ToInt32(row[0].ItemArray[8].ToString()) == 1; Console.WriteLine(row[0].ItemArray[7]); Console.WriteLine(isManager); this.Hide(); TrangChu f = new TrangChu(isManager, username); f.Text = "Trang Chủ"; f.ShowDialog(); } else { alertLabel.Visible = true; } }