Windows Form Application C# - Confirmation Message on Add, Edit, Delete?

[gyprosetti]

I have created a Windows C# Web Form Application in Visual Studio 2013 for adding, editing and deleting records in a database. I want to display a confirmation message whenever changes have been made to the database. What do I add and where do I add it? The code below is the opening part of the form and includes the insert query.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace somecityform
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("Data Source=MY-PC;Initial Catalog=somecity;Integrated Security=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("Insert into somecity.staff (forename, surname, office, email) Values ('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')", con);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }