上传文件时的进度条加载问题

public partial class Process : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        AspnetUpload upldr = new AspnetUpload();
        upldr.RegisterModelessProgressBar(this.Button1);
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string fpath = (Request.PhysicalApplicationPath, "UpFiles");
        UploadFile file = AspnetUpload.GetUploadFile("File1");
        
            if (file != null)
                file.SaveAs((fpath, Path.GetFileName(file.get_FileName())));
        
        
    }
为什么我的进度条出来并显示上传了，但结果确实没有上传？
求高手解救。。。