把生成图片的代码放在一个aspx页面中，在PageLoad事件中把图片写入输出流：
private void Page_Load(object sender, System.EventArgs e) {
string code = Request.Params["code"];
Bitmap image = DrawImage(code);
Response.ContentType = "image/gif";
image.Save(Response.OutputStream,System.Drawing.Imaging.ImageFormat.Gif);
Response.End();
}
在需要引用图片的地方，设定图片URL为生成图片的aspx页面：
ImageCode.ImageUrl = "CodeImage.aspx?code="+code;
2.使用System.Web.HttpContext.Current来实现一些页面中常用的方法，比如：
public class WebApp{
public static void ShowMessage(string message){
HttpContext.Current.Response.Write ("<script language=javascript>alert('"+message+"')</script>");
}
public static string CurrentUser{
get{
return HttpContext.Current.Session["UserID"]+"";
}
}
}
3.在自定义的Web控件中，把Javascript脚本文件编译为内嵌的资源，然后从资源中读取脚本并注册。
public class Res {
public static StreamReader GetStream(Type type,string name){
//Assembly assembly = Assembly.GetAssembly(type);
Assembly assembly = type.Assembly;
Stream stream = assembly.GetManifestResourceStream(type,name);
return new StreamReader(stream);
}
}
public class ScriptControl : Control {
/// <summary>
/// Register Client Script Block
/// </summary>
/// <param name="control">custom web control</param>
/// <param name="scriptfile">resource script file name</param>
public void RegisterScript(string scriptfile){
if (!this.Page.IsClientScriptBlockRegistered(scriptfile)) {
StreamReader reader = Res.GetStream(this.GetType(),scriptfile);
using(reader){
string script
= "<script language=\"javascript\" type=\"text/javascript\"> <!-- "
