Problem while Read a binary values from database

Question

I used this coding for retrieve  image from database and bind it to the image control inside data list, this code already worked properly ,now i am used another one application it not read a binary values from database.. what the problem..



<asp:DataList ID="DataList1" RepeatColumns="2" RepeatDirection="Horizontal" CssClass="aligncenter"  runat="server">

       

              <ItemTemplate>

              

                <table>

                    <tr>

                    

                        <td>

                            <asp:Image ID="Image1" ImageUrl='<%# "ImageHandler.ashx?id=" + Eval("gname")%>' Width="300px" Height="220px" runat="server" /></td>

                    </tr>

                

                </table>

              </ItemTemplate>

          

    </asp:DataList>

server side coding:

Da_Layer DL = new Da_Layer();

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            string query = "select * from gallery";

            DataSet ds = DL.Grid(query);

            DataList1.DataSource = ds.Tables[0];

            DataList1.DataBind();

        }

    }

ImageHandler.ashx coding:

<%@ WebHandler Language="C#" Class="ImageHandler" %>

using System;

using System.Web;

using System.Data.SqlClient;

public class ImageHandler : IHttpHandler {

    Da_Layer DL = new Da_Layer();

    

    public void ProcessRequest (HttpContext context) 

    {

        //context.Response.ContentType = "text/plain";

        //context.Response.Write("Hello World");

        string query = "select * from gallery where gname='"+context.Request.Params["id"]+"'";

        SqlDataReader dr = DL.ExecuteReader(query);

        dr.Read();

        Byte[] Imagedata = (byte[])dr["gphoto"];

       // context.Response.BinaryWrite(dr["gphoto"]);

        context.Response.BinaryWrite(Imagedata);

        

        dr.Close();

       

    }

 

    public bool IsReusable {

        get {

            return false;

        }

    }

}

i change context.Request.Params["id"] and directly give input for select query and 
i run ImageHandler.ashx it give the Output System.byte[]
but correct answer it need to give some binary values in browser


What is the problem...... in this application i used both c# and vb


also i used this coding for convert binary value from database to image,it also not give correct answer,my question is if i want read binary value any change need web.config file

DL.OpenConnection();

        FileStream fs = new FileStream(@"c:\xx.jpg", FileMode.CreateNew, FileAccess.Write);

      

        cmd = new SqlCommand("select * from staffdetails where staff_id='" + txt_id.Text + "'", DL.connection);

        dr = cmd.ExecuteReader();

        if (dr.Read())

        {

            byte[] b = (byte[])(dr["photo"]);

            fs.Write(b, 0, b.Length);

        }

        fs.Close();

        DL.CloseConnection();

        

        GridView1.Visible = false;

        DetailsView1.Visible = true;

        DetailsView1.DataBind();