GridView控件中的ImageField没有DataField属性，那么如何才能绑定到SQL Server中的Image Field？自从DynamicImage控件从beta2中消失后，这就成了个问题。但是，ASP.NET2.0随之也给我们带来了另外一种解决方案，那就是方便地利用HttpHandler(.ashx)动态显示数据库中的图片，这点在VS2005中提供了PersonalWebSite等模版中已经给出方案：通过ashx动态获取数据库中的某条图片数据，然后在GridView等控件的自定义模版中安置一个Image控件，并设置Image控件的ImageUrl属性为类似 XXX.ashx?photoId=1 即可显示图片。
<%@ WebHandler Language="C#" Class="GetPicture" %>
using System;
using System.Web;
using System.IO;
using System.Data.SqlClient;

public class GetPicture : IHttpHandler {   
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "image/jpeg";
        context.Response.Cache.SetCacheability(HttpCacheability.Public);
        context.Response.BufferOutput = false;       
        Stream stream = null;

        if (context.Request.QueryString["PhotoID"] != null &&
            context.Request.QueryString["PhotoID"] != "")
        {
            string photoId = context.Request.QueryString["PhotoID"];
            stream = GetPhoto(photoId);
        }
        else
            return;
        const int buffersize = 1024 * 16;
        byte[] buffer = new byte[buffersize];
        if (stream == null || stream.Length < 1)
            return;           
        int count = stream.Read(buffer, 0, buffersize);
        while (count > 0) {
            context.Response.OutputStream.Write(buffer, 0, count);
            count = stream.Read(buffer, 0, buffersize);
        }
    }
   
    public Stream GetPhoto(string fileTypeID){
        SqlConnection myConnection = new SqlConnection("Integrated Security=SSPI;Initial Catalog=WebWindows;Data Source=guosong");
        SqlCommand myCommand = myConnection.CreateCommand();
        myCommand.CommandText = "GetFileTypeIcon";
        myCommand.CommandType = System.Data.CommandType.StoredProcedure;

        myCommand.Parameters.Add(new SqlParameter("@fileTypeID", fileTypeID));
        myConnection.Open();
        object result = myCommand.ExecuteScalar();
       
        try{
            return new MemoryStream((byte[])result);
        }
        catch (ArgumentNullException e){
            return null;
        }
        finally{
            myConnection.Close();
        }
    }
    public bool IsReusable {
        get {
            return false;
        }
    }
}
 
 <asp:TemplateField HeaderText="ICON">
     <ItemTemplate>
      <asp:Image ID="Image1" runat="server" ImageUrl='<%# "GetPicture.ashx?PhotoID=" + Eval("FileTypeID") %>' />
     </ItemTemplate>
 </asp:TemplateField>