Populating Table from DataSet in HTML Page for Sending Email ASP.Net

private void SendEmail(string OrderID, string CustomerEmail, string ProductName, string ProductPrice, string ProductFinalPrice, string Quantity, string Merchant, string ProductCode)
    {
        string contents = File.ReadAllText(Server.MapPath("~/index.html"));
        contents = contents.Replace("[Date]", DateTime.Now.ToString("dddd, dd MMMM yyyy"));
        contents = contents.Replace("[OrdID]", OrderID);
        contents = contents.Replace("[Product Name]", ProductName);
        contents = contents.Replace("[QR Product Name]", ProductName);
        contents = contents.Replace("[Actual Price]", ProductPrice);
        contents = contents.Replace("[Final Price]", ProductFinalPrice);
        contents = contents.Replace("[Quantity]", Quantity);
        contents = contents.Replace("[Vendor]", Merchant);
        contents = contents.Replace("[Code]", ProductCode);
        contents = contents.Replace("[Customer]", CustomerEmail);
        string table = "<table>";
        for (int i = 0; i < ds.Rows.Count; i++)
        {
            table += "<tr>";
            table += "<td>" + ds.Rows[i]["Column1"].ToString() + "</td>";
            table += "<td>" + ds.Rows[i]["Column2"].ToString() + "</td>";    
            table += "</tr>";
        }
        table += "</table>";
        contents = contents.Replace("[Table]", table);
    }