GBK编码 各大搜索引擎编码问题

<span id="text11666" class="javascript">switch(SearchKey) <br> { <br> case "baidu"://百度搜索引擎匹配 <br> key = System.Web.HttpUtility.UrlEncode(key,System.Text.Encoding.Default); <br> SearchAddr = @"http://www.baidu.com/s?wd=" + key + @"&amp;cl=3";  <br> break; <br> case "Google"://Google搜索引擎匹配 <br> key = System.Web.HttpUtility.UrlEncode(key,System.Text.Encoding.GetEncoding("utf-8")); <br> SearchAddr = @"http://www.google.com/search?hl=zh-CN&amp;q=" + key + @"&amp;lr=";  <br> break; <br> case "yahoo"://yahoo搜索引擎匹配 <br> key = System.Web.HttpUtility.UrlEncode(key,System.Text.Encoding.GetEncoding("utf-8")); <br> SearchAddr = @"http://www.yahoo.com.cn/search?ei=UTF-8&amp;fr=fp-tab-web-ycn&amp;p=" + key + @"&amp;meta=vl%3Dlang_zh-CN%26vl%3Dlang_zh-TW"; <br> break; <br> case "myself"://本站搜索匹配 <br> SearchAddr = null; <br> break; <br> default:break; <br> } <br><br> 很简单了,只是百度使用GBK编码的,我找了很久都没有找到相应的编码格式, <br> 1个小时后我试了试Default的,结果ok........   - -!! </span>