fileupload 上传控件

<div>
<asp:FileUpload ID="FileUpload1" runat="server" />

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上传" />
</div>

protected void Button1_Click(object sender, EventArgs e)
    {
        if (this.FileUpload1.HasFile)
        {
            string fileName = Path.GetExtension(this.FileUpload1.FileName);
            string path = Server.MapPath("upload/");
            //在上传的同时重命名
            this.FileUpload1.SaveAs(path+Guid.NewGuid()+fileName);
            Response.Write("上传成功!");

        }
        else
        {
            Response.Write("请选择文件");
        }
    }