private void btnUpdate_Click(object sender, EventArgs e) { //update data c.contactId = int.Parse(txtCntID.Text); c.firstName = txtFirstName.Text; c.lastName = txtLastName.Text; c.email = txtEmail.Text; c.contactNo = txtCntNo.Text; c.address = txtAddress.Text; c.gender = comboGender.Text; bool isSuccess = c.update(c); if (isSuccess == true) { MessageBox.Show("Contact Successfully Updated "); clear(); } else { MessageBox.Show("Faild to Updated Contact try again"); } //load data table DataTable dt = c.Select(); dgvContact.DataSource = dt; }