Populate textbox on listbox selection (mysql)

private void Form2_Load(object sender, EventArgs e)
        {
            label5.Text = "To update a new user simply click on there name to the left \n edit the form and click Update User";

            myConnection.GetConnection();
            DataSet sds = new DataSet();
            MySqlCommand sql = new MySqlCommand("SELECT * FROM users", myConnection.GetConnection());
            MySqlDataAdapter mydap = new MySqlDataAdapter(sql);
            mydap.Fill(sds, "users");
            this.UserList.DataSource = sds.Tables["users"];
            this.UserList.DisplayMember = "name";

        }

        private void UserList_SelectedIndexChanged(object sender, EventArgs e)
        {
            //int cid = Int32.Parse(this.UserList.SelectedValue.ToString());
            MySqlCommand sql1 = new MySqlCommand("SELECT * FROM users WHERE name = '" + this.UserList.SelectedValue.ToString() + "'", myConnection.GetConnection());
            MySqlDataAdapter DA = new MySqlDataAdapter(sql1);
            DataSet DS = new DataSet();
            DA.Fill(DS, "users");

            this.Usernametxtbox.Text = DS.Tables[0].Rows[0]["name"].ToString();
        }