Problem in Time delay in wpf

Hi,

    I have a one textbox and one button..if i click the button it will display the email (retrieve the emails from sql database) in textbox..each 2 seconds email has been change in textbox till last email in database

XAML coding..

<Grid>
        <TextBox Height="39" HorizontalAlignment="Left" Margin="183,65,0,0" Name="textBox1" VerticalAlignment="Top" Width="210" IsEnabled="False"/>
        <Button Content="Button" Height="39" HorizontalAlignment="Left" Margin="439,54,0,0" Name="button1" VerticalAlignment="Top" Width="87" Click="button1_Click" />
    </Grid>

C# coding...

using System.Windows.Threading;
private void button1_Click(object sender, RoutedEventArgs e)
    {
        con = new SqlConnection(cn);
        con.Open();
        SqlCommand cmdemail = new SqlCommand("gettomails", con);
        cmdemail.CommandType = CommandType.StoredProcedure;
        SqlDataReader drfromemail = cmdemail.ExecuteReader();

        while (drfromemail.Read())
        {
            
            textBox1.Text = drfromemail["toemailid"].ToString();
            DispatcherTimer dispatcherTimer = new DispatcherTimer();
            //MessageBox.Show("");
            dispatcherTimer.Interval = new TimeSpan(0, 0, 10);
            dispatcherTimer.Start();
            
        }
    }