求jsp图片上传代码

protected void Button1_Click(object sender, EventArgs e)
    {
        simg = upload(FileUpload1, simg);
        string sql = "update users set u_image='" + simg + "' where u_name='" + Session["come"].ToString() + "'";
        cj.executeNonquery(sql);
        Response.Write("<script>alert('头像修改成功！');window.location.href='per.aspx';</script>");
    }

补充：.NET技术 ,  ASP.NET