---27311326571405
is called boundary and it is a random string that should never appear in the data you are sending and is used as separator between the values.
Here's an example of sending such a request to a given address:
class Program
{
static void Main()
{
var data = new List<KeyValuePair<string, string>>(new[]
{
new KeyValuePair<string, string>("list", "8274184"),
new KeyValuePair<string, string>("list", "8274174"),
new KeyValuePair<string, string>("list", "8274178"),
new KeyValuePair<string, string>("antirobot", "2341234"),
new KeyValuePair<string, string>("votehidden", "1"),
});
string boundary = "----MyAppBoundary" + DateTime.Now.Ticks.ToString("x");
var request = (HttpWebRequest)WebRequest.Create("http://example.com");
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.Method = "POST";
using (var requestStream = request.GetRequestStream())
using (var writer = new StreamWriter(requestStream))
{
foreach (var item in data)
{
writer.WriteLine("--" + boundary);
writer.WriteLine(string.Format("Content-Disposition: form-data; name="{0}"", item.Key));
writer.WriteLine();
writer.WriteLine(item.Value);
}
writer.WriteLine(boundary + "--");
}
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
using (var reader = new StreamReader(responseStream))
{
Console.WriteLine(reader.ReadToEnd());
}
}
}
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