protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.FileUpload1.HasFile)
        {
            string path, filepath;
            path = Server.MapPath(".");
            filepath = path + this.FileUpload1.FileName;
            this.FileUpload1.SaveAs(filepath);
            this.Image1.Visible = true;
            this.Image1.ImageUrl = "." + this.FileUpload1.FileName;
            
         }
        else
        {
            Label1.Text = "this is null!";
        }各位帮我改一下,为什么执行的时候图片可以上传却没有显示?