Programatically accessing SharePoint List using REST API in CSOM

using Newtonsoft.Json.Linq; //JSON.Net

static void Main(string[] args)
        {
var webUri = new Uri("https://Your SharePoint Server/sites/IA/");
            const string userName = "username";
            const string password = "password";
            var securePassword = new SecureString();
            foreach (var c in password)
            {
                securePassword.AppendChar(c);
            }
            var credentials = new SharePointOnlineCredentials(userName, securePassword);
            var list = GetList( credentials);
            //print List title
            Console.WriteLine(list["Title"]);
}



public static JToken GetList(ICredentials credentials)
        {
            using (var client = new WebClient())
            {
                client.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");
                client.Credentials = credentials;
                client.Headers.Add(HttpRequestHeader.ContentType, "application/json;odata=verbose");
                client.Headers.Add(HttpRequestHeader.Accept, "application/json;odata=verbose");
                                var result = client.DownloadString("https://Your Server name/sites/IA/_api/web/lists/getbytitle('Listname')");
                var t = JToken.Parse(result);
                return t["d"];
            }
        }