WebRequest 请求页页出错,求助！

Question

          for (int i = coll.PageStart; i < coll.PageEnd; i++)
            {
                url = coll.GetUrl.Replace("{$page$}", i.ToString());
                WebRequest request;
                request=WebRequest.Create(url);//请求uri
              
                stream = request.GetResponse().GetResponseStream();//当请求的URL页面有错误时这里就会报错            
               
                strRead = new StreamReader(stream, code);//读取流
                HtmlCode = strRead.ReadToEnd();
                strRead.Close();
            } 比如，请求一个ASP页面 http://xxx.com/show.asp?id=123  这个页面本身就有执行时错误，在浏览器中可以看到错误提示,   
有什么办法捕获这个错误且继续下轮循环？　　比如我想请求 show.asp?id=100 到 id=200的页．这其中有些页面可能存在错误，当请求错误时不管当前的前面进行一轮循环？在线等！

Answer 1

for (int i = coll.PageStart; i < coll.PageEnd; i++)
            {
try
{
                url = coll.GetUrl.Replace("{$page$}", i.ToString());
                WebRequest request;
                request=WebRequest.Create(url);//请求uri
              
                stream = request.GetResponse().GetResponseStream();//当请求的URL页面有错误时这里就会报错            
               
                strRead = new StreamReader(stream, code);//读取流
                HtmlCode = strRead.ReadToEnd();
                strRead.Close();
}
catch{}
            }

Answer 2

for (int i = coll.PageStart; i < coll.PageEnd; i++)
{
  try
  {
      url = coll.GetUrl.Replace("{$page$}", i.ToString());
      WebRequest request;
      request=WebRequest.Create(url);//请求uri
              
      stream = request.GetResponse().GetResponseStream();           
               
       strRead = new StreamReader(stream, code);//读取流
       HtmlCode = strRead.ReadToEnd();
      strRead.Close();  }
  catch()
  {
     continue;
  }
}