You can use the HttpWebRequest and HttpWebResponse classes to achieve this.
For example, to POST to an HTML form that has two fields, username and password you would do something like this:
NameValueCollection nv = new NameValueCollection();
nv.Add("username", "bob");
nv.Add("password", "password");
string method = "POST"; // or GET
string url = "http://www.somesite.com/form.html";
HttpStatusCode httpStatusCode;
string response = SendHTTPRequest(nv, method, url, out httpStatusCode);
public static string SendHTTPRequest(NameValueCollection data,
string method,
string url,
out HttpStatusCode httpStatusCode)
{
StringBuilder postData = new StringBuilder();
foreach(string key in data)
{
postData.Append(key + "=" + data[key] + "&");
}
if(method == "GET" && data.Count > 0)
{
url += "?" + postData.ToString();
}
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.Method = method;
httpWebRequest.Accept = "*/*";
httpWebRequest.ContentType = "application/x-www-form-urlencoded";
if(method == "POST")
{
using(Stream requestStream = httpWebRequest.GetRequestStream())
{
using(MemoryStream ms = new MemoryStream())
{
using(BinaryWriter bw = new BinaryWriter(ms))
{
bw.Write(Encoding.GetEncoding(1252).GetBytes(postData.ToString()));
ms.WriteTo(requestStream);
}
}
}
}
return GetWebResponse(httpWebRequest, out HttpStatusCode httpStatusCode);
}
private static string GetWebResponse(HttpWebRequest httpWebRequest,
out HttpStatusCode httpStatusCode)
{
using(HttpWebResponse httpWebResponse =
(HttpWebResponse)httpWebRequest.GetResponse())
{
httpStatusCode = httpWebResponse.StatusCode;
if(httpStatusCode == HttpStatusCode.OK)
{
using(Stream responseStream = httpWebResponse.GetResponseStream())
{
using(StreamReader responseReader = new StreamReader(responseStream))
{
StringBuilder response = new StringBuilder();
char[] read = new Char[256];
int count = responseReader.Read(read, 0, 256);
while(count > 0)
{
response.Append(read, 0, count);
count = responseReader.Read(read, 0, 256);
}
responseReader.Close();
return response.ToString();
}
}
}
return null;
}
}