Trying to Post to a site using WebClient in C#

[coder2050]

I'm trying to Post to a site using WebClient in C# but it doesn't seem to Post the values at all

I try posting two strings to a testform that I have set up on my localhost. In the PostBack of the page I update a label to say "Login Succesfull" if the correct username/password have been entered. But the PostBack code is never triggered to begin with after the code below runs. It just returns the login page as the response. What am I doing wrong?

string msSite = "http://localhost/testform";
WebClient oClient = new WebClient();
oClient.QueryString.Add("username", "test");
oClient.QueryString.Add("password", "test");
string msConnect = oClient.DownloadString(msSite);

[sknake]

Hello coder 2050 and welcome to Daniweb! :)

Please use code tags when you paste code on Daniweb, it helps keep the threads clean.

To answer your question you will want to do something like this. Also -- Are you sure that you shouldn't be submitting form fields instead of the query string?

private static void DoPost()
    {
      string userName = "test";
      string password = "test";
      string URL = string.Format(@"http://www.website.com/login.aspx?user={0}&password={1}", userName, password);
      HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(URL);
      req.Method = "POST";
      using (Stream s = req.GetRequestStream())
      {
        string postData = "a";
        byte[] bPostData = System.Text.ASCIIEncoding.UTF8.GetBytes(postData);
        s.Write(bPostData, 0, bPostData.Length);
        s.Flush();
        s.Close();
        s.Dispose();
        WebResponse resp = req.GetResponse();
        resp.Close();
      }
    }

[coder2050]

Hey sknake,

I tried the code below and I end up with the same thing. It doesn't seem to trigger a postback when I look at the content returned from the webresponse.

What i'm trying to do is
1) Log into a Form on a website with Username/Password
2) Automatically fill in the start and end date fields on the form that is returned after a succesful login
3) POST these final values and get back a csv file

How would I submit these are form fields?

[sknake]

Have you looked on google?

/* 
 * Required references 
 */ 
 using System.Net; 
 using System.IO; 
/* 
 * Usage. This url is real and you can use it for testing. 
 */ 
  string url = "http://www.nicecleanexample.com"; 
  url += "/PublicTest/autosubmit.php?cmd=login"; 
  
  oRequest = WebRequest.Create(url); 
/* 
 * Set values so server expects post data 
 */ 
  oRequest.Method = "POST"; 
  oRequest.ContentType = "application/x-www-form-urlencoded"; 
/* 
 * Must url encode data going to server 
 */ 
  string postdata = "txtName=my%20name&txtPassword=secret"; 
  oRequest.ContentLength = postdata.Length; 
/* 
 * Send post data into request stream first 
 */ 
  StreamWriter sw = new StreamWriter(oRequest.GetRequestStream()); 
  sw.Write(postdata); 
  sw.Close(); 
/* 
 * Connect, send and get response 
 */ 
  oResponse = oRequest.GetResponse(); 
  StreamReader sr = new StreamReader(oResponse.GetResponseStream()); 
  
  string pagedata = sr.ReadToEnd();

Taken from: http://www.nicecleanexample.com/ViewSnippet.aspx?TID=dotnet_submitform

After searching: http://www.google.com/search?hl=en&q=C%23+submit+form+fields&aq=f&oq=&aqi=

If you still have issues then post your new code and we'll go from there.

[coder2050]

Checked multiple sites.

Does the above code you pasted work for you when you try to Post? If you were to try and Post to a test login page would it perform a Postback on the login page or just display the page as if it had just loaded?