将附件从ASP Classic传递到.Net电子邮件Web服务

My company has a C# .Net based web service for sending email. This web service does not currently support attachments. We have many old ASP Classic pages that are still using CDONTS for sending emails (including ones with attachments). My current task is to find out if we can add attachment support to the web service such that we can replace the ASP Classic CDONTS with calls to the web service. What I'm getting hung up on is this: is it possible to pass those files that need to be attached to the web service from ASP Classic.My company has a C# .Net based web service for