Q:

Rendering bytes from sql server to an image control?

Markup:
<asp:ListView ID="lvGallery" runat="server" DataSourceID="SqlDataSource1">
    <LayoutTemplate>
        <table runat="server" id="tableGallery">
            <tr runat="server" id="itemPlaceHolder"></tr>       
        </table>       
    </LayoutTemplate>
    <ItemTemplate>       
    <tr>
        <td>
            <div class="box_img2">
                <div class="g_size">
                    <a runat="server" id="linkImage">
                        <img id="Image1" runat="server" src="MyImage.jpg" />
                    </a>
                </div>         
            </div>
        </td>
    </tr>
   </ItemTemplate>
</asp:ListView>    
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="..."  ProviderName="System.Data.SqlClient"  SelectCommand="SELECT [Image] FROM [GalleryImages]"></asp:SqlDataSource>

Code-behind:
public void ProcessRequest(HttpContext context)
{
    //write your handler implementation here.
    string username = Convert.ToString(context.Request.QueryString["username"]);
    if (username != null)
    {
        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter();
        byte[] arrContent;
        DataRow dr;
        string strSql;
        strSql = "Select Image from GalleryImages where username = '" + username + "'";
        da = new SqlDataAdapter(strSql, connection.ConnectionString);
        da.Fill(ds);
        dr = ds.Tables[0].Rows[0];
        arrContent = (byte[])dr["ImageFile"];
        context.Response.ContentType = "jpeg";
        context.Response.OutputStream.Write(arrContent, 0, arrContent.Length);
        context.Response.End();
    }
}

I have also added httphandlers section in web.config. But I don't get  the images in ListView control.

A:

You have to create an http handler that returns the image 
public void ProcessRequest(HttpContext context)
{
    byte[] yourImage = //get your image byte array
    context.Response.BinaryWrite(yourImage);
    context.Request.ContentType = "image/jpeg";
    context.Response.AddHeader("Content-Type", "image/jpeg");
    context.Response.AddHeader("Content-Length", (yourImage).LongLength.ToString());
    con.Close();

    context.Response.End();
    context.Response.Close();
}

You can can do that by creating a GenericHandler file type from the visual studio and add the previous code in then you can call you can write the url of the generic handler as the image source

A:

Cool question.  I would write a class implementing IHttpHandler which responds to requests for the image file(s).
See my answer in the following question for an example of how to get file streams in and out of a SQL varbinary(max) field.
How to make a fileupload interface in ASP.NET
Don't forget to use the correct MIME type when crafting the HTTP response.

