ASP.NET Form Export to Word CSS Settings

Hello Experts,

I have a button click event that will export my datagrid to a word document. The code works to bring the information out, but it is not applying my css styles that I have defined. Is there a way that I can replace the css style that is created with the export my css defined in the /Portals/0/portal.css file. (see attached code for button click).

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
        Response.AddHeader("content-disposition", "attachment;filename=Export.doc")
        Response.Cache.SetCacheability(HttpCacheability.NoCache)
        Response.ContentType = "application/vnd.word"

        Dim stringWrite As New System.IO.StringWriter()
        Dim htmlWrite As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(stringWrite)
        Dim fi As FileInfo = New FileInfo(Server.MapPath("Portals/0/portal.css"))

        Dim sb As New System.Text.StringBuilder
        Dim sr As StreamReader = fi.OpenText()
        Do While sr.Peek() >= 0
            sb.Append(sr.ReadLine())
        Loop
        sr.Close()

        ' Create a form to contain the grid
        Dim frm As New HtmlForm()
        applicationGrid.Parent.Controls.Add(frm)
        frm.Attributes("runat") = "server"
        frm.Controls.Add(applicationGrid)
        frm.RenderControl(htmlWrite)

        Response.Write(stringWrite.ToString())
        Response.[End]()
    End Sub

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