How to alert automatically when new row added in datagridview or table in C#

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i have a windows form application in which I have a Datagridview.

I have linked the Datagridview to a sql Server database.

I added a timer for my application to update the datagridview with new records from the database.

Now I would like to display a message (alert) to the user only when new rows are added to the datagridview and it should not stop the win form application from running.

How can I do this please please Help?

Thanks

What I have tried:

private void frmpractice1_Load(object sender, EventArgs e)
       {
           dataGridView1.DataSource = ConnectionClass.Selectcommand("Select  DISTINCT Invoice_No,Customer_Name,Time from tblAIMode  ");
           dataGridView1.RowsAdded += new DataGridViewRowsAddedEventHandler(dataGridView1_RowsAdded);
           timer1.Interval = 5000;
           timer1.Tick += new EventHandler(UpdateDataGridView);
           timer1.Start();
       }

       private void UpdateDataGridView(object sender, EventArgs e)
       {
           dataGridView1.DataSource = ConnectionClass.Selectcommand("Select  DISTINCT Invoice_No,Customer_Name,Time from tblAIMode  ");

       }

       private void dataGridView1_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
       {
           MessageBox.Show("New Row added");
           dataGridView1.RowsAdded -= new DataGridViewRowsAddedEventHandler(dataGridView1_RowsAdded);
       }