试用了一下asp.net 2.0的上传控件，还是挺方便的。

分享代码如下：

    protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            判断文件大小#region 判断文件大小
            int intFileLength = this.FileUpload1.PostedFile.ContentLength;

            if (intFileLength > 50000)
            {
                this.Label1.Text = "文件大于50k，不能上传";
                return;
            }
            #endregion

            判断保存的文件夹是否存在#region 判断保存的文件夹是否存在
            string strUpPath = @"upfile\"   System.DateTime.Now.ToShortDateString();// @"\";

            //文件夹不存在的时候，创建文件夹
            if (!System.IO.Directory.Exists(Server.MapPath(strUpPath)))
            {
                System.IO.Directory.CreateDirectory(Server.MapPath(strUpPath));
            }
            
            string strUrl = Server.MapPath(strUpPath   @"\"   this.FileUpload1.FileName);
            #endregion
            
            //上传文件
            this.FileUpload1.SaveAs(strUrl);

            this.Label1.Text = "文件上传成功";

        }
        catch (System.Exception ex)
        {
            this.Label1.Text = "文件上传失败:"   ex.Message;
        }
    }