static void Main(string[] args)
{
    GetWI ex = new GetWI();
    ex.GetWorkItemsByWiql();
}
public void GetWorkItemsByWiql()
{
    string _personalAccessToken = "xxxx";
    string _credentials = Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", "", _personalAccessToken)));

    //this is needed because we want to create a project scoped query
    string project = "Agileportfolio";

    //create wiql object
    var wiql = new
    {
        query = "Select [State], [Title] " +
                "From WorkItems " +
                "Where [Work Item Type] = 'Bug' " +
                "And [System.TeamProject] = '" + project + "' " +
                "And [System.State] = 'New' " +
                "Order By [State] Asc, [Changed Date] Desc"
    };

    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("https://test.visualstudio.com");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", _credentials);

        //serialize the wiql object into a json string
        var postValue = new StringContent(JsonConvert.SerializeObject(wiql), Encoding.UTF8, "application/json"); //mediaType needs to be application/json for a post call

        var method = new HttpMethod("POST");
        var httpRequestMessage = new HttpRequestMessage(method, "https://abrahamdhanyaraj.visualstudio.com/_apis/wit/wiql?api-version=2.2") { Content = postValue };
        var httpResponseMessage = client.SendAsync(httpRequestMessage).Result;

        if (httpResponseMessage.IsSuccessStatusCode)
        {
            WorkItemQueryResult workItemQueryResult = httpResponseMessage.Content.ReadAsAsync<WorkItemQueryResult>().Result;

            //now that we have a bunch of work items, build a list of id's so we can get details
            var builder = new System.Text.StringBuilder();
            foreach (var item in workItemQueryResult.WorkItems)
            {
                builder.Append(item.Id.ToString()).Append(",");
            }

            //clean up string of id's
            string ids = builder.ToString().TrimEnd(new char[] { ',' });

            HttpResponseMessage getWorkItemsHttpResponse = client.GetAsync("_apis/wit/workitems?ids=" + ids + "&fields=System.Id,System.Title,System.State&asOf=" + workItemQueryResult.AsOf + "&api-version=2.2").Result;

            if (getWorkItemsHttpResponse.IsSuccessStatusCode)
            {
                var result = getWorkItemsHttpResponse.Content.ReadAsStringAsync().Result;
                //Read title

            }

         }

        // Create Channel
        string name = "xyzz3";

        var payload = new
        {
            token = "xoxp-291239704800-292962676087-297314229698-a80e720d98e443c8afb0c4cb2c09e745",
            name = "xyzz3",
        };
        var serializedPayload = JsonConvert.SerializeObject(payload);
        var response = client.PostAsync("https://slack.com/api/channels.create" + "?token=test&name=" + name + "&pretty=1",
        new StringContent(serializedPayload, Encoding.UTF8, "application/json")).Result;
        if (response.IsSuccessStatusCode)
        {
            dynamic content = JsonConvert.DeserializeObject(
                response.Content.ReadAsStringAsync()
                .Result);
        }

        }

  }