lo que hice una vez fue pasar los datos de una grilla (gridview) a excel.
Esta en ASP.NET espero te sirva o ayude como guia
Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click
Dim sb As StringBuilder = New StringBuilder()
Dim sw As StringWriter = New StringWriter(sb)
Dim htw As HtmlTextWriter = New HtmlTextWriter(sw)
Dim pagina As Page = New Page
Dim form = New HtmlForm
GridView2.Visible = True
GridView2.EnableViewState = False
pagina.EnableEventValidation = False
pagina.DesignerInitialize()
pagina.Controls.Add(form)
form.Controls.Add(GridView2)
pagina.RenderControl(htw)
Response.Clear()
Response.Buffer = True
Response.ContentType = "application/vnd.ms-excel"
Response.AddHeader("Content-Disposition", "attachment;filename=Informe_2_" & Trim(txtFecha.Text) & ".xls")
Response.Charset = "UTF-8"
Response.ContentEncoding = Encoding.Default
Response.Write(sb.ToString())
Response.End()
GridView2.Visible = False
End Sub
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