private static async Task<string>getWebTitle(webUrl)
    {
        string webUrl="MYSHAREPOINTSITE";
        //Creating Password
        string PWD = "MYPASSWORD";
        string USER = "MYUSER";
        string RESTURL = "_api/web/lists/GetByTitle('My Repo')/items";


        //Creating Credentials
        var passWord = new SecureString();
        foreach (var c in PWD) passWord.AppendChar(c);
        var credential = new SharePointOnlineCredentials(USER, passWord);


        using (var handler = new HttpClientHandler() { Credentials = credential })
        {
            //Getting authentication cookies
            Uri uri = new Uri(webUrl);
            handler.CookieContainer.SetCookies(uri, credential.GetAuthenticationCookie(uri));

            //Invoking REST API
            using (var client = new HttpClient(handler))
            {
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                HttpResponseMessage response = await client.GetAsync(string.Format(RESTURL, webUrl)).ConfigureAwait(false);
                response.EnsureSuccessStatusCode();

                string jsonData = await response.Content.ReadAsStringAsync();

                return jsonData;
            }
        }
    }