private void add_Click(object sender, EventArgs e) { c.id = id.Text; c.name = name.Text; c.email = email.Text; c.gender = gender.Text; c.address = address.Text; c.phone = phone.Text; bool sucess = c.insert(c); if (sucess = true) { MessageBox.Show("insert sucess...!"); } else { MessageBox.Show("faild to insert...!"); } DataTable dt = c.Select(); dgvContactList.DataSource = dt; }