Event (OnChange) of (SqlDependency) object occur like the timers , not only on the change appear in the database

Hi< xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

I have Use this Code snippet to apply the concept of notification in SQL Server 2005 Developer Edition April CTP and Also I use VS.NET 2005 Beta2

But the problem the Event (OnChange) of (SqlDependency) object occur like the timers hundreds time not only on the change appear in the database … Why and How can stop this event to occur only when the change in the database

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        private int ChangeCount = 0;

        private DataSet dataSet = new DataSet();

        private delegate void UICallback();

        public Form1()

        {

            InitializeComponent();

        }

        private void btnGetData_Click(object sender, EventArgs e)

        {

            GetData();

            this.ChangeCount = 0;

        }

        private void GetData()

        {

            this.dataSet.Clear();

            string strConnection = @"Data Source=server\SQL2005;Integrated Security=True;Initial Catalog=FraasDB";

            SqlConnection SQLConnection = new SqlConnection(strConnection);

            string SQL = "SELECT * FROM Table_1";

            SqlDataAdapter SQLDataAdapter = new SqlDataAdapter(SQL, SQLConnection);

            SqlDependency SQLDependency = new SqlDependency(SQLDataAdapter.SelectCommand);

            SQLDependency.OnChange += new OnChangeEventHandler(this.SQLDependency_OnChange);

            SQLDataAdapter.Fill(dataSet, "Table1");

            this.dataGridView1.DataSource = dataSet;

            this.dataGridView1.DataMember = "Table1";

        }

        void SQLDependency_OnChange(object sender, SqlNotificationEventArgs e)

        {

                this.ChangeCount++;

                this.Invoke(new UICallback(ReBind));

                MessageBox.Show(e.Info.ToString());

        }                              

        private void ReBind()

        {

            GetData();

            this.toolStripStatusLabel1.Text = this.ChangeCount.ToString();

        }

    }

}

And also when I try to get information about the changes type with the help of this line of code Invalid value

void SQLDependency_OnChange(object sender, SqlNotificationEventArgs e)

{

     MessageBox.Show(e.Info.ToString());

}

And thanks with my best regarding