Using server.mapath to retrieve a file from a physical path

Trying to read my file at:-

Physical Path    h:\root\home\snookertable-001\www\site1\DisplayLatestNews

from the server where my site is hosted

if (!Page.IsPostBack)
            {
                if (System.IO.File.Exists(Server.MapPath("h:\\root\\home\\snookertable-001\\www\\site1\\DisplayLatestNews")))
                {
                    System.IO.StreamReader StreamReader2 = new System.IO.StreamReader(Server.MapPath("h:\\root\\home\\snookertable-001\\www\\site1\\DisplayLatestNews"));
                    TextBox1.Text = StreamReader2.ReadToEnd();
                    StreamReader2.Close();
                }
            }

Just comes back with a non descriptive error, I have used "\\" instead of "\" as it does not like just the one backslash, any ideas please ?