页面代码如下：

    
        上传|         取消上传    
        
     

处理文件UploadHandler.ashx.cs代码如下：

/// 
    /// $codebehindclassname$ 的摘要说明    /// 
    [WebService(Namespace = "http://tempuri.org/")]    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]     public class UploadHandler : IHttpHandler    {        public void ProcessRequest(HttpContext context)        {            context.Response.ContentType = "text/plain";               context.Response.Charset = "utf-8";                HttpPostedFile file = context.Request.Files["Filedata"];               string  uploadPath =                 HttpContext.Current.Server.MapPath(@context.Request["folder"])+"\\";               if (file != null)              {                 if (!Directory.Exists(uploadPath))                 {                     Directory.CreateDirectory(uploadPath);                 }                  file.SaveAs(uploadPath + file.FileName);                  //下面这句代码缺少的话，上传成功后上传队列的显示不会自动消失               context.Response.Write("1");              }               else              {                   context.Response.Write("0");               }          }         public bool IsReusable        {            get            {                return false;            }        }    }