I'm using CsQuery lib. It's helpful and easy to use. https://www.nuget.org/packages/CsQuery
Use some class like that:
public class WebClientEx : WebClient
{
public CookieContainer _cookies = new CookieContainer();
public string Get(string URL)
{
return this.DownloadString(URL);
}
public WebClientEx()
{
this.Encoding = Encoding.UTF8;
System.Net.ServicePointManager.Expect100Continue = false;
}
protected override WebRequest GetWebRequest(Uri address)
{
var request = (HttpWebRequest)base.GetWebRequest(address);
request.Host = "apps.db.ripe.net";
request.UserAgent = "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0";
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
request.KeepAlive = true;
request.Proxy = new WebProxy();
request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
request.CookieContainer = _cookies;
request.Headers.Add("Accept-Language", "en-us;q=0.7,en;q=0.3");
request.ContentType = "application/x-www-form-urlencoded";
return request;
}
public string Post(string URL, NameValueCollection data)
{
return this.Encoding.GetString(this.UploadValues(URL, data));
}
}
Setup the post parameters as you want. Then just do:
WebClientEx client = new WebClientEx();
string Page = client.Get("https://apps.db.ripe.net/syncupdates/simple-rpsl.html"); //get some cookies and viewstate
CQ dom = CQ.Create(Page);
string viewstate = dom["input#javax\\.faces\\.ViewState"].Val(); //get viewstate
NameValueCollection data = new NameValueCollection();
data.Add("rpslBox:postRpsl", "rpslBox:postRpsl");
data.Add("rpslBox:postRpsl:sourceRadioSelect", "RIPE_NCC");
data.Add("rpslBox:postRpsl:rpslObject", "your some string"); //your string
data.Add("rpslBox:postRpsl:update", "Update");
data.Add("javax.faces.ViewState", viewstate);
Page = client.Post("https://apps.db.ripe.net/syncupdates/simple-rpsl.html", data);