This page demonstrates uploading a file with an Anthem button.

If you are using Anthem on a web site running ASP.NET 1.1 or above, you can use the System.Web.UI.HtmlControls.HtmlInputFile control (e.g. <input type="file" runat="server"/>) to select the file to upload. See the Microsoft knowledgebase articles KB323245 or KB323246 for details on how to work with the HtmlInputFile control via code.

If you are using Anthem on a web site running ASP.NET 2.0 or above, you can use the System.Web.UI.WebControls.FileUpload control (e.g. <ASP:FileUpload runat="server"/>) or Anthem.FileUpload control (e.g. <anthem:FileUpload runat="server"/>) to select the file to upload.

File Upload Control