如何读写数据库二进制图片

 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 Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        //把图片保存成数据库二进制形式
        Stream ImageStream;
        string Path = FileUpload1.PostedFile.FileName;// 文件名称
        int Size = FileUpload1.PostedFile.ContentLength; // 文件大小
        string Type = FileUpload1.PostedFile.ContentType; // 文件类型
        ImageStream = FileUpload1.PostedFile.InputStream;
        byte[] Content = new byte[Size];
        int Status = ImageStream.Read(Content, 0, Size);

        SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]);
        SqlCommand comm = new SqlCommand("insert into testimage (UserName,Image,Path,Type) values(@UserName,@Image,@Path,@Type)", conn);

        comm.CommandType = CommandType.Text;
        comm.Parameters.Add("@UserName", SqlDbType.VarChar, 255).Value = txtUserName.Text;
        comm.Parameters.Add("@Image", SqlDbType.Image).Value = Content;
        comm.Parameters.Add("@Path", SqlDbType.VarChar, 255).Value = Path;
        comm.Parameters.Add("@Type", SqlDbType.VarChar, 255).Value = Type;

        conn.Open();
        comm.ExecuteNonQuery();
        conn.Close();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //把数据库二进制图片转存到硬盘中
        string connStr = ConfigurationSettings.AppSettings["ConnectionString"];
        SqlConnection conn = new SqlConnection(connStr);
        string sql = "select * from testimage";
        SqlCommand cmd = new SqlCommand(sql, conn);
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        while (dr.Read())
        {
            byte[] bytes = (byte[])dr["Image"];
            FileStream fs = new FileStream(@"c:/" + dr["UserID"] + ".jpg", FileMode.Create, FileAccess.Write);
            fs.Write(bytes, 0, bytes.Length);
            fs.Flush();
            fs.Close();
        }
        dr.Close();
        conn.Close();
    }
}