i want access database values to be retrieved in asp.net page containing textbox and button on button click textbox should get the data from access file and i am getting the output...

using System;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
 
public partial class _Default : System.Web.UI.Page
{
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:/Documents and Settings/abby1/My Documents/Visual Studio 2008/WebSites/WebSite3/App_Data/TEST.mdb");
OleDbDataReader rdr = null;
protected void Page_Load(object sender, EventArgs e)
{
 
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
try
{
conn.Open();
OleDbCommand str = new OleDbCommand("select appno from final", conn);
OleDbDataReader rdr = str.ExecuteReader();
DataSet ds = new DataSet();
if (rdr.HasRows)
{
while (rdr.Read())
{

TextBox1.Text = Convert.ToString(str);
}
}
}
catch
{
conn.Close();
}
}
 
private string ToString(string p)
{
throw new NotImplementedException();
}
}