Help me to create POST query correctly in C#

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Hello everybody! I want to write a program in C# that will automatically create email accounts and for this purpose I wrote a captcha reader class. Now I want to create a POST command that will send to the server the data about user. How can I correctly determine the format of the command?
HEre is what i wrote:

//-------------------------------------------------------------------------------
//Create HttpWebRequest instance
            HttpWebRequest postRequest = (HttpWebRequest)WebRequest.Create(url);
//specify the method
            postRequest.Method = "Post";
            postRequest.ContentType = "application/x-www-form-urlencoded";
//create namevalue collection for sending to the server name value pairs (is it //correctly?)
            NameValueCollection nvc = new NameValueCollection();
            nvc.Add("_token", sessionID);
            nvc.Add("_uname", "lalala123");
            .........
//I dont know how should I exactly create the message
            byte[] btPostData = Encoding.ASCII.GetBytes("_token" + nvc.Get("_token"));

            postRequest.ContentLength = btPostData.Length;
            Stream postData = postRequest.GetRequestStream();
            postData.Write(btPostData, 0, btPostData.Length);
            HttpWebResponse response2 = (HttpWebResponse)postRequest.GetResponse();
            Stream responseStream2 = response.GetResponseStream();
            StreamReader reader2 = new StreamReader(responseStream2);
            String response22 = reader2.ReadToEnd();
            ;
//-------------------------------------------------------------------------------

Thanks in advance!

[edit]Code block added - OriginalGriff[/edit]

Posted 16-Apr-11 7:43am

leon4ic

Updated 16-Apr-11 8:37am

OriginalGriff

v2

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Patrick Kalkman 17-Apr-11 8:26am

Can you tell me what is wrong with your implementation, does it give an error? If so, what kind of error?

EricThe 27-Dec-11 22:39pm

i sure would like to see the captcha reader code cause i am trying to do one need some ideas

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Martin Arapovic · Answer 1 · 2012-02-04T00:13:00

Hi,

I don't know what parameters you want (need) to send but how create post params in general you can find here[^]. There are many other examples on net.

In general post data is formatted like any other query string (Key1=Value1&Key2=Value2 and so on...)
Yours post data will look like this: _token=100&_uname=lalala123
Also when you creating post data you need to encode values using

C#

System.Web.HttpUtility.UrlEncode()

method.
And that's pretty much all you need to make successful post request...