you can do it. first you record process by httpwatch or in IE9 (Press F12) and get the details of url, refer, accept, request body and resposnse. than in asp.net use these information by using system.net here is simple example
public string siteOutput(string url,string Method,string refer,string ContentType,string reqBody)
{
HttpWebRequest request;
HttpWebResponse response;
CookieContainer coo = new CookieContainer();
request.CookieContainer = coo;
request = (HttpWebRequest)WebRequest.Create(url);
request.Method =Method;
request.Referer =refer;
request.ContentType = ContentType;
poststring =reqBody;
using (Stream sm = request.GetRequestStream())
{
byte[] databyte = System.Text.Encoding.ASCII.GetBytes(poststring);
sm.Write(databyte, 0, (int)databyte.Length);
}
response = (HttpWebResponse)request.GetResponse();
string strPageOutPut = new StreamReader(response.GetResponseStream()).ReadToEnd();
return strPageOutPut
}