JQuery外掛程式ajaxfileupload.js異步上傳檔案實例_jquery

public void FileUpload(HttpContext context)
        {
            try
            {
                context.Response.ContentType = "text/html";
                string companyname = context.Request.Params["companyname"];
                string billno = context.Request.Params["billno"];
                string filename = context.Request.Params["filename"];
                string name = companyname "_" billno "_" filename;
                HttpFileCollection files = HttpContext.Current.Request.Files;
                //指定以伺服器上上傳檔案的儲存路徑
                string savePath = context.Server.MapPath("~/upload/");
                //檢查伺服器是否有此實體路徑，且若不存在則建立
                if (!System.IO.Directory.Exists(savePath))
                {
                    System.IO.Directory.CreateDirectory(savePath);
                }
                savePath = savePath name;//上傳檔案路徑
                files[0].SaveAs(savePath);//儲存檔案
                context.Response.Write(savePath);
            }
            catch (Exception ex)
            {
                context.Response.Write("FileUpload: " ex.Message);
            }

        }