从网络上下载数据

/// <summary>
/// 售房网下载数据
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static string GetResponseString(string url)
{
string _StrResponse = "";
HttpWebRequest _WebRequest = (HttpWebRequest)WebRequest.Create(url);
_WebRequest.UserAgent = "MOZILLA/4.0 (COMPATIBLE; MSIE 7.0; WINDOWS NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)";
_WebRequest.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
_WebRequest.Method = "GET";
WebResponse _WebResponse = _WebRequest.GetResponse();
StreamReader _ResponseStream = new StreamReader(_WebResponse.GetResponseStream(), System.Text.Encoding.GetEncoding("GBK"));
_StrResponse = _ResponseStream.ReadToEnd();
_WebResponse.Close();
_ResponseStream.Close();
return _StrResponse;
}