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{
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string uriString = "http://localhost:1165/WebTest/MyLogin.aspx";
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WebClient webClient = new WebClient();
byte[] responseData = webClient.DownloadData(uriString);
string srcString = Encoding.UTF8.GetString(responseData);
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webClient = new WebClient();
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string viewStateFlag = "id=\"__VIEWSTATE\" value=\"";
int i = srcString.IndexOf(viewStateFlag) + viewStateFlag.Length;
int j = srcString.IndexOf("\"",i);
string viewState = srcString.Substring(i, j-i);
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