Here is my situation. Im trying to learn how to take full advantage of multithreading but am at a rump.
I have one listbox of usernames and it checks them on a website to see if they exist or not. If they exist it puts the username into listbox2.
Now that portion works fine. But im wondering how i can use say 5 threads to go through the list and check the names quicker. My code is as follows:
//Start
public void button5_Click(object sender, EventArgs e)
{
try
{
for (int i = 0; i < 1; i++)
{
// listBox1.SelectedIndex = i;
Thread thread1 = new Thread(new ThreadStart(this.getSite));
thread1.Start();
while (thread1.IsAlive)
{
Application.DoEvents();
}
if(!(thread1.IsAlive))
{
label2.Text = "Count: " + listBox2.Items.Count;
}
}
}
catch (Exception ex)
{
throw ex;
}
}
public void getSite()
{
for (int j = 0; j < listBox1.Items.Count; j++)
{
string uri = @"http://www.website.com";
string username = listBox1.Items[j].ToString();
string data = "accountName=" + username;
string source = "";
source = getInfo(data, uri);
if (source.Contains("nswer"))
{
listBox2.Invoke(new UpdateTextCallback(this.addUsername), new object[] { username });
}
}
}// END GET SITE
//Used to invoke username into listbox2
public void addUsername(string user)
{
// Add the listbox text
listBox2.Items.Add(user);
}
//Used to invoke username into listbox2
public delegate void UpdateTextCallback(string user);
public static string getInfo(string DATA, string URL)
{
HttpWebRequest req = (HttpWebRequest)System.Net.WebRequest.Create(URL);
req.Method = "post";
req.ContentType = "application/x-www-form-urlencoded";
req.AllowAutoRedirect = true;
// Encode data and post it
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(DATA);
req.ContentLength = DATA.Length;
Stream os = req.GetRequestStream();
os.Write(bytes, 0, bytes.Length);
os.Close();
// Get response
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
StreamReader ResponseStream = new StreamReader(resp.GetResponseStream());
string Source = "";
Source = ResponseStream.ReadToEnd();
return Source;
}My problem is i wouldnt know how to tell it to skip the username that is being checked by another thread. Any help is greatly appreciated.