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Description: Test whether a computer is alive or not.

do it by ping.

Link: http://www.codekeep.net/snippets/85d2d68d-4cf1-47b2-83a5-44ae2efb5e91.aspx

//Check whether the node is alive or not. If alive, return the IP.
        protected static string CheckNodeConnectivity (string hostName)
        {
            bool nodeIsAlive=false;
            string nodeIP = string.Empty;
            using (Ping ping=new Ping() )
            {
                try
                {
                    PingReply reply = ping.Send(hostName, 600); //600 ms
                    if (reply.Status ==IPStatus .Success )
                    {
                        nodeIsAlive = true;
                        nodeIP = reply.Address.ToString();
                    }
                }
                catch (Exception err)
                {
                   // Console.WriteLine("Error has occurred in method CheckNodeConnectivity: " +err.Message );
                }

            }
            return nodeIP;
        }

Description: This code is used to extract any tag from the HTML source.

Link: http://www.codekeep.net/snippets/540a0ee3-d816-42dc-aa6f-4fff23eb23fe.aspx

private string ExtractAnchor(string strAStream)
    {
        string strAnchor = "";
        string arrAnchor = "";
        int aIndex = strAStream.ToLower().IndexOf("<a");
        while (aIndex != -1)
        {
            strAStream = strAStream.Substring(strAStream.ToLower().IndexOf("<a"));

            strAnchor = strAStream.Substring(0, strAStream.ToLower().IndexOf(">") + ">".Length);

            strAStream = strAStream.Substring(strAStream.ToLower().IndexOf(">") + ">".Length);
            aIndex = strAStream.IndexOf("<a");

            arrAnchor += arrAnchor + ", ";
        }
        return arrAnchor;
    }

Description: This code is used to read contents of a given file.

Link: http://www.codekeep.net/snippets/adf5054b-78fb-449f-8423-b693cb6b34fb.aspx

    public static string GetFileContents(string FileName)
    {
        StreamReader sr = null;
        string FileContents = null;

        try
        {
            FileStream fs = new FileStream(FileName, FileMode.Open,
                                           FileAccess.Read);
            sr = new StreamReader(fs);
            FileContents = sr.ReadToEnd();
        }
        finally
        {
            if (sr != null)
                sr.Close();
        }

        return FileContents;
    }

Description: This code is used to get HTML source code of any given URL.

Link: http://www.codekeep.net/snippets/85d76a91-5ab0-4580-9a56-065b971b97b6.aspx

public static string GetHtmlPageSource(string url, string username, string password)
    {
        System.IO.Stream st = null;
        System.IO.StreamReader sr = null;
        try
        {
            // make a Web request
            System.Net.WebRequest req = System.Net.WebRequest.Create(url);
            // if the username/password are specified, use these credentials
            if (username != null && password != null)
                req.Credentials = new System.Net.NetworkCredential(username, password);
            // get the response and read from the result stream
            System.Net.WebResponse resp = req.GetResponse();
            st = resp.GetResponseStream();
            sr = new System.IO.StreamReader(st);
            // read all the text in it
            return sr.ReadToEnd();
        }
        catch (Exception ex)
        {
            return string.Empty;
        }
        finally
        {
            // always close readers and streams
            sr.Close();
            st.Close();
        }
    }