multiple data store in table

for (int i=0; i < this.listBox1.SelectedItems.Count; i++)
{


SqlConnection con = new SqlConnection("server=INFO-PROJECT4\\SQLEXPRESS;database=nss;integrated security=true");
con.Open();
SqlCommand cmd = new SqlCommand("insert into sss(city) values(@city)",con);

cmd.Parameters.AddWithValue("@city", listBox1.SelectedItems[i].ToString());
cmd.ExecuteNonQuery();
MessageBox.Show("success");
con.Close();

}