Display DataGridView record in MessageBox at some interval using C# in Windows Application

Refer below code.

private void Form1_Load(object sender, EventArgs e)
{
    timer1.Start();
    BindGrid();
}

private void BindGrid()
{
    //Hide the last blank line.
    dataGridView1.AllowUserToAddRows = false;

    //Clear Columns.
    dataGridView1.Columns.Clear();

    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[] { 
            new DataColumn("Sr.No", typeof(int)),
            new DataColumn("SName", typeof(string)),
            new DataColumn("Phone No",typeof(string)),
            new DataColumn("Address",typeof(string)) });
    dt.Rows.Add(1, "A", "12345", "H");
    dt.Rows.Add(2, "B", "54321", "G");
    dt.Rows.Add(3, "C", "23456", "C");
    dt.Rows.Add(4, "D", "76543", "D");
    dt.Rows.Add(5, "E", "34567", "B");
    dt.Rows.Add(6, "F", "87654", "A");
    dt.Rows.Add(7, "G", "34557", "M");
    dt.Rows.Add(8, "H", "56789", "N");

    dataGridView1.DataSource = dt;
    dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
}
public static int count = 0;
private void timer1_Tick(object sender, EventArgs e)
{
    string message = RowMessage();
    if (!string.IsNullOrEmpty(message))
    {
        Thread.Sleep(5000); // 5 Seconds.
        Delay(100).ContinueWith(_ => MessageBox.Show("Name\tNumber\tAddress\n" + message, "Information", MessageBoxButtons.OK, MessageBoxIcon.Information));
    }
    else
    {
        timer1.Stop();
    }
}

private string RowMessage()
{
    string message = "";
    for (int j = 0; j < dataGridView1.Rows.Count; j++)
    {
        if (count < dataGridView1.Rows.Count)
        {
            string name = dataGridView1.Rows[count].Cells[1].Value.ToString();
            string phone = dataGridView1.Rows[count].Cells[2].Value.ToString();
            string address = dataGridView1.Rows[count].Cells[3].Value.ToString();
            message += name + "\t" + phone + "\t" + address + "\n";
            count++;
            if (count % 3 == 0)
            {
                break;
            }
        }
        else
        {
            break;
        }
    }
    return message;
}

public static Task Delay(double milliseconds)
{
    var tcs = new TaskCompletionSource<bool>();
    System.Timers.Timer timer = new System.Timers.Timer();
    timer.Elapsed += (obj, args) =>
    {
        tcs.TrySetResult(true);
    };
    timer.Interval = milliseconds;
    timer.AutoReset = false;
    timer.Start();
    return tcs.Task;
}