Read HTML file and display it on ASP.Net Web Page

1. Add a DIV on the page

<div id="dvHtml" runat="server"></div>

2. Then write the following code

  protected void Page_Load(object sender, EventArgs e)
    {
        string body = string.Empty;
        using (System.IO.StreamReader reader = new System.IO.StreamReader(Server.MapPath("~/MyFile.htm")))
        {
            dvHtml.InnerHtml = reader.ReadToEnd();
        }
    }