How to add different column values as Tooltip for DropDownList in ASP.NET

protected void btnLoad_Click(object sender, EventArgs e)
{
    string strCon = System.Configuration.ConfigurationManager.ConnectionStrings["sqlConnection"].ToString();
    
    SqlConnection conn = new SqlConnection(strCon);
    conn.Open();
    SqlDataAdapter da = null;
    DataSet dsCountry = new DataSet();
    try
    {
        string strCountrySQL = "select id, name, Address from dbo.Customer";
        da = new SqlDataAdapter(strCountrySQL, conn);
        da.Fill(dsCountry);
        DropDownList1.DataSource = dsCountry;
        DropDownList1.DataTextField = "name";
        DropDownList1.DataValueField = "id";
        DropDownList1.DataBind();
    
        int ItemCount = DropDownList1.Items.Count;
        for (int i = 0; i < ItemCount; i++)
        {
            DropDownList1.Items[i].Attributes.Add("Title", dsCountry.Tables[0].Rows[i]["Address"].ToString());
        }
        DropDownList1.Items.Insert(0, new ListItem("--Select--", "--Select--"));
        DropDownList1.SelectedItem.Selected = false;
        DropDownList1.Items.FindByText("--Select--").Selected = true;
    }
    catch (Exception ex)
    {
        lblMsg.Text = "Error!! <br>+" + ex.Message.ToString();
    }
    finally
    {
        dsCountry.Dispose();
        da.Dispose();
        conn.Close();
        conn.Dispose();
}