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string cssPath = "css/common.css";
string htmlUrl = @"http://topic.csdn.net/u/20120925/22/953c6420-7b9d-4603-91cc-cd501a9c713f.html?id=3";
string basePath = Path.GetDirectoryName(htmlUrl);
string result = Path.Combine(basePath, cssPath).Replace(@"\", "/");
Response.Write(result);