insert,update and delete using c#

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

namespace Insert_update_delete
{
    public partial class Form1 : Form
    {
        SqlConnection cn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;User Instance=True");
        SqlCommand cmd = new SqlCommand();
        SqlDataReader dr;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            cmd.Connection = cn;
            Loadlist();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (txtId.Text != "" & txtName.Text != "")
            {
                cn.Open();
                cmd.CommandText = "Insert into info (Id, Name) Values('"+txtId.Text+"' , '"+txtName.Text+"')";
                cmd.ExecuteNonQuery();(it is showing error here )
                cmd.Clone();
                MessageBox.Show("Record Inserted!");
                cn.Close();
                txtId.Text = "";
                txtName.Text = "";
                Loadlist();
            }
        }
        private void Loadlist()
        {
            listBox1.Items.Clear();
            listBox2.Items.Clear();
            cn.Open();
            cmd.CommandText = "Select * From info";
            dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    listBox1.Items.Add(dr[0].ToString());
                    listBox2.Items.Add(dr[1].ToString());
                }
            }

            cn.Close();
        }

        private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            ListBox l = sender as ListBox;
            if(l.SelectedIndex != -1)
            {
                listBox1.SelectedIndex = l.SelectedIndex;
                listBox2.SelectedIndex = l.SelectedIndex;
                txtId.Text = listBox1.SelectedItem.ToString();
                txtName.Text = listBox2.SelectedItem.ToString();
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (txtId.Text != "" & txtName.Text != "")
            {
                cn.Open();
                cmd.CommandText = "Delete from info where id*'"+txtId.Text+"' and name*'"+txtName.Text+"'";
                cmd.ExecuteNonQuery();
                cn.Close();
                MessageBox.Show("Record Deleted");
                Loadlist();
                txtId.Text = "";
                txtName.Text = "";

            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (txtId.Text != "" & txtName.Text != "" & listBox1.SelectedIndex != -1)
            {
                cn.Open();
                cmd.CommandText = "Update info set id='"+txtId.Text+"', name='"+txtName.Text+"' where id='"+listBox1.SelectedItem.ToString()+"' and name= '"+listBox2.SelectedItem.ToString()+"'";
                cmd.ExecuteNonQuery();
                cn.Close();
                MessageBox.Show("Record Updated");
                Loadlist();
                txtId.Text = "";
                txtName.Text = "";

            }
        }
    }
}