Memory Leak with Mysql on a Windows Server 2003.

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using MySql.Data.MySqlClient;
using System.Diagnostics;
using System.Net;
using System.IO;
 
public partial class _Default : System.Web.UI.Page 
{
    private Boolean gblnTurnOff;
    private readonly string gstrConnection = "server=192.168.0.6;user id=pmadata;password=xxxxx;persist security info=True;database=pronto;Pooling=False";
 
    protected void Button_Start_Click(object sender, EventArgs e)
    {
        int i = 0;
        gblnTurnOff = false;
        while (!gblnTurnOff)
        {
            DataTable t = GetRctAddresses();
        }
    }
 
    protected void Button_Stop_Click(object sender, EventArgs e)
    {
        gblnTurnOff = true;
    }
 
    /// <summary>
    /// Get the RCT addresses from MySQL
    /// </summary>
    /// <returns></returns>
    private DataTable GetRctAddresses()
    {
        DataTable rctaddress = new DataTable();
        using (MySqlConnection gmysqlConn = new MySqlConnection(gstrConnection))
        {
            try
            {
                if (gmysqlConn.State.Equals(ConnectionState.Closed))
                    gmysqlConn.Open();
 
                if (gmysqlConn.State.Equals(ConnectionState.Open))
                {
                    MySqlCommand cmd = new MySqlCommand("sp_deldoc_getrctaddress", gmysqlConn);
                    cmd.Parameters.Clear();
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.UpdatedRowSource = UpdateRowSource.None;
 
                    MySqlDataAdapter da = new MySqlDataAdapter(cmd);
                    da.SelectCommand.CommandTimeout = 260;
                    da.SelectCommand = cmd;
                    da.Fill(rctaddress);
                    da.Dispose();
                    cmd.Dispose();
                }
            }
            catch (MySqlException exmysql)
            {
                LogMessageL("TESTERR616 " + exmysql.Message);
            }
            catch (Exception ex)
            {
                LogMessageL("TESTERR010 " + ex.Message);
            }
            finally
            {
                //close connection
                gmysqlConn.Close();
                gmysqlConn.Dispose();
            }
        }
 
        return rctaddress;
    }
 
    //A function for Locally Logging on the harddrive for the Windows Server
    private void LogMessageL(string Message)
    {
        //Open a file
        FileStream fs = new FileStream(@"c:\testing\testing.txt",
            FileMode.OpenOrCreate, FileAccess.Write);
        //Create a stream writer
        StreamWriter m_streamWriter = new StreamWriter(fs);
        //Determine the length of the file
        m_streamWriter.BaseStream.Seek(0, SeekOrigin.End);
        //Create a string with the log message
        String s = " testing : " + Message;
        //add the date time
        m_streamWriter.WriteLine(s.PadRight(100) + DateTime.Now.ToString());
        //flush the stream
        m_streamWriter.Flush();
        //close the connection
        m_streamWriter.Close();
    }
}