asp.net上传图片

界面代码

<asp:Image ID="Image1" runat="server" ImageUrl="~/pic/def.gif" Width="85px" />
    <br />
    <asp:FileUpload ID="FileUpload1" runat="server" />
    <br />
    <asp:Button ID="Button5" runat="server" onclick="Button5_Click" Text="Button" />

cs文件代码

protected void Button5_Click(object sender, EventArgs e)
        {
            if (FileUpload1.FileName != "")
            {
                string file = FileUpload1.FileName; //得到文件名
                FileUpload1.PostedFile.SaveAs(Server.MapPath("pic/" + file)); //上传图片
                Image1.ImageUrl = "~/pic/" + file;
            }
        }