private void btnSave_Click(object sender, EventArgs e) { string connectionString = string.Format("server={0};userid={1};password={2};database={3};", txtServ.Text, txtUser.Text, txtPass.Text, txtDB.Text); try { SqlHelper helper = new SqlHelper(connectionString); if (helper.IsConnection) { DatabaseLibrary setting = new DatabaseLibrary(); setting.SaveConnectionString("cn", connectionString); MessageBox.Show("Connection Save!"); } } catch (Exception ex) { MessageBox.Show(ex.Message); } }