ClientContext clientContext = new    ClientContext("https://innergen.sharepoint.com/sites/mydevsite");
    Web web = clientContext.Web;
    clientContext.Load(web);
    clientContext.ExecuteQuery();

    Console.WriteLine("Web Site Name : " + web.Title);
    Console.ReadLine();

NetworkCredential credentials =
     new NetworkCredential("username", "pwd", "domain");
clientContext .Credentials = credentials;

clientContext.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;

using (ClientContext clientContext = new ClientContext("HTTPS://YOURSHAREPOINTONLINESITE"))
        {
            string userName = "xyz";
            string password = "abc";
            SecureString secpassword = new SecureString();
            foreach (char c in password.ToCharArray()) secpassword.AppendChar(c);
            // SharePoint Online Credentials
            clientContext.ExecutingWebRequest += clientContext_ExecutingWebRequest;
            clientContext.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials;
            // Get the SharePoint web
            Web web = clientContext.Web;
            // Load the Web properties
            clientContext.Load(web);
            // Execute the query to the server.
            clientContext.ExecuteQuery();
            // Web properties - Display the Title and URL for the web
            Console.WriteLine("Title: " + web.Title + "; URL: " + web.Url);
            Console.ReadLine();
            Console.ReadKey();
        }