C#删除文件及记录。

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.QueryString["id"]!= null)
        {
            SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["conn"]);
            conn.Open();
            SqlDataAdapter cmd = new SqlDataAdapter("select * from img where imgid=" + Request.QueryString["id"].Trim(), conn);
            DataSet ds = new DataSet();
            cmd.Fill(ds, "img");
            if (ds.Tables["img"].Rows.Count > 0)
            {
                try
                {
                    DataRowView drv = ds.Tables["img"].DefaultView[0];
                    string path = drv.Row["imgpath"].ToString();
                    File.Delete(path);
                    SqlCommand cmds = new SqlCommand("delete from img where imgid=" + Request.QueryString["id"].Trim(), conn);
                    cmds.ExecuteNonQuery();
                    Response.Write("<script>alert('删除成功！')</script>");
                }
                catch (Exception ex)
                {
                    Response.Write(ex);
                }
                finally
                {
                    conn.Close();
                }
            }
            else
            {
                Response.Redirect("login.aspx");
            }
        }
    }
}我初学者，刚学习.net做呢也是用的ASP的思路，大家也就不要笑，在到删除图片那一步比如是5.jpg那张图片就报错"System.IO.DirectoryNotFoundException: 未能找到路径“c:\Program Files\Microsoft Visual Studio 8\Common7\IDE\img\3.jpg”的一部分"但是我数据库里存的路径是img\5.jpg,为什么把软件的安装目录给加上去了。大侠求解。