Calling Table API from C#

[adam_faulkinber]

I'm trying to use a put request via C# HttpClient.   I keep getting 400 Bad Request in my response.   I've done everything I can find on the wiki with no success.   Can anyone tell me what I'm missing?   This is for a Eureka instance.   Here is my code:

                     string postText = "{\"assigned_to\":\"" + MySydId + "\"," +
                                                                 "\"state\":\"3\"," +
                                                                 "\"cmdb_ci\":\"" + configItem + "\"," +
                                                                 "\"comments\":\"" + comments + "\"}";
                       string url = "https://<INSTANCENAME>.service-now.com/api/now/table/<TABLENAME>/" + currentTicket.Sys_ID;
                       HttpContent content = new StringContent(JsonConvert.SerializeObject(postText), Encoding.UTF8, "application/json");
                       HttpClientHandler restHandler = new HttpClientHandler { Credentials = new NetworkCredential(Environment.GetEnvironmentVariable("UserName"), <PASSWORD>) };
                       using (HttpClient rest = new HttpClient(restHandler))
                       {
                               Uri sNowURI = new Uri(url);
                               rest.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                               HttpResponseMessage response = rest.PutAsync(sNowURI, content).Result;
                               response.EnsureSuccessStatusCode();
                       }

The table is a custom table.       The account I am using has the rest_service role and I am able to see the xml data for the record when I paste the url into my browser.

After posting this, I saw that I was missing a comma in the JSON string.   Now I am getting a 505 HTTP Version Not Supported error.  

[harpreet11]

Thanks a lot Adam, Yes I have used table API and add Configuration settings for Cross Origin Resource Sharing(CORS) in ServiceNow. Then it works fine for me.