How to show "new" label right side of the row in gridview? "It means new record added in gridview"

Create one XML file called Symbol.xml;

static int rowsCount;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            LoadGrid();
            string xmlFilePath = Server.MapPath(@"App_Data/Symbols.xml");
            if (File.Exists(xmlFilePath))
            {
                DataSet ds1 = new DataSet();

                ds1.ReadXml(xmlFilePath);
                rowsCount = ds1.Tables[0].Rows.Count;
            }
        }
    }

    private void LoadGrid()
    {
        string xmlFilePath = Server.MapPath(@"App_Data/Symbols.xml");
        if (File.Exists(xmlFilePath))
        {   using (DataSet ds = new DataSet())
            {
                ds.ReadXml(xmlFilePath);               
                grdvAutoRefresh.DataSource = ds;
                grdvAutoRefresh.DataBind();               
                if (rowsCount > 0)
                {
                    int rows = ds.Tables[0].Rows.Count;
                    int remrows = rows - rowsCount;
                    if (remrows > 0)
                    {
                        for (int i = rowsCount; i < ds.Tables[0].Rows.Count; i++)
                        {

                            grdvAutoRefresh.Rows[i].Cells[3].Text = grdvAutoRefresh.Rows[i].Cells[3].Text + "        " + "New";
                            rowsCount = rows;
                        }
                    }
                    else if (remrows < 0)
                    {
                        rowsCount = rows;
                    }
                }
            }
        }
    }

 protected void Timer1_Tick(object sender, EventArgs e)
    {
        LoadGrid();
    }