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       string postString = "userName=user1&password=password1";
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       byte[] postData = Encoding.ASCII.GetBytes(postString);
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       byte[] responseData = webClient.UploadData(uriString, "POST", postData);
       // ·µ»ØµÄ½«×Ö½ÚÊý×éת»»³É×Ö·û´®(HTML)
       string srcString = Encoding.UTF8.GetString(responseData);
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