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Send form-data using HttpClient C#

I'm trying to make an API call to third party URL, which is working fine through postman, but same request through C# HttpClient not working.
This is how I'm sending request in postman
C# Sample Code
var nvc = new List<KeyValuePair<string, string>>();
nvc.Add(new KeyValuePair<string, string>("PARAM1", "PARAM1 Value"));
nvc.Add(new KeyValuePair<string, string>("PARAM2", "PARAM2 Value"));
nvc.Add(new KeyValuePair<string, string>("PARAM3", "PARAM3 Value"));
var req = new HttpRequestMessage(HttpMethod.Post, "Https://ThirdPartyURL") {
Content = new FormUrlEncodedContent(nvc)
};
Am I doing anything wrong here?
UPDATE #1:
**
Fiddler Traces for postman request(which is working fine)
Fiddler Traces for C# Request(which is failing)
Thanks in advance!
Regards,
Moksh

Instead of
var nvc = new List<KeyValuePair<string, string>>();
try to create a new class:
public class RecipientSender
{
public string Recipient_First_Name {get; set;}
public string Recipient_Last_Name {get; set;}
.....
}
and create httpclientrequest like this:
....
....
var recipientSender=new RecipientSender { Recipient_FirstName=..., }
var contentType = new MediaTypeWithQualityHeaderValue("application/json");
httpClient.DefaultRequestHeaders.Accept.Add(contentType);
var stringData = JsonConvert.SerializeObject(recipientSender);
contentData = new StringContent(stringData, Encoding.UTF8, "application/json");
var httpResponseMessage=client.PostAsync(url, contentData);
.....

Twilio REST Api call bad request

I've implemented Twilio REST API with C# successfully earlier. However, all of a sudden the API calls that are made keep getting 400 - BAD REQUEST.
The response body doesn't contain any specific error either...
I'll say it again, it worked for a week or two and all of sudden it returns BAD REQUEST.
The code is exact the following below.
public async Task SendSmsAsync(string number, string message)
{
var accountSid = _configuration["Authentication:Twilio:AccountSID"];
var authToken = _configuration["Authentication:Twilio:AuthToken"];
var twilioNumber = _configuration["Authentication:Twilio:Number"];
var credentials = new NetworkCredential(accountSid, authToken);
var handler = new HttpClientHandler { Credentials = credentials };
using (var client = new HttpClient(handler))
{
var url = $"https://api.twilio.com/2010-04-01/Accounts/{ accountSid }/Messages";
var body = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("To", number),
new KeyValuePair<string, string>("From", twilioNumber),
new KeyValuePair<string, string>("Body", message),
};
var content = new FormUrlEncodedContent(body);
content.Headers.ContentType.CharSet = "UTF-8";
var response = await client.PostAsync(url, content);
if (response.IsSuccessStatusCode)
{
//Uri success = response.Headers.Location;
}
}
}

Supplying api key in HttpClient's headers not working

I'm trying to get data from https://ndb.nal.usda.gov, basing on instructions provided here https://ndb.nal.usda.gov/ndb/doc/apilist/API-FOOD-REPORT.md
I'm using HttpClient as follows, but can't seem to be able to pass the api_key correctly. Shouldn't I be adding it to headers? I tried
public static async Task<string> DownloadItemData(string itemName)
{
using (HttpClient client = new HttpClient())
{
HttpContent requestContent =
new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("api_key", "myKey"),
new KeyValuePair<string, string>("ndbno", "01009"),
new KeyValuePair<string, string>("type", "f")
});
requestContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
HttpResponseMessage response = await client.PostAsync("http://api.nal.usda.gov/ndb/reports", requestContent);
using (StreamReader reader = new StreamReader(await response.Content.ReadAsStreamAsync()))
{
// Write the output.
string result = await reader.ReadToEndAsync();
return result;
}
}
But all I'm getting is:
{
"error": {
"code": "API_KEY_MISSING",
"message": "No api_key was supplied. Get one at http://api.nal.usda.gov"
}
}
I also tried this, but with the same result:
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("api_key", "myKey");
Any ideas how to pass the api_key correctly? Thanks in advance!

API Post request C# URL

I got this url
http://www.stuff.com/ws/BIWS/service.php?key=sdf9&type=find&query=funktioner:orsearch(%224804255620%22)
I need a "post"-api request, with XML returned data.
I need to use a post because get is limited to ~2000 characters, and I need to send a lot of data in orsearch. What am I doing wrong, how can I debug this?
var clientt = new HttpClient();
clientt.BaseAddress = new Uri("http://www.stuff.com");
var request = new HttpRequestMessage(HttpMethod.Post, "/ws/BIWS/service.php?");
var keyValues = new List<KeyValuePair<string, string>>();
keyValues.Add(new KeyValuePair<string, string>("key", "sdf9"));
keyValues.Add(new KeyValuePair<string, string>("type", "find"));
keyValues.Add(new KeyValuePair<string, string>("query", "funktioner:orsearch('4804255620')"));
request.Content = new FormUrlEncodedContent(keyValues);
var response = await clientt.SendAsync(request);
string content = await response.Content.ReadAsStringAsync();
// Error wrong key entered or something, but url works fine

Post Method in Windows Phone 8

I need to send some parameters to a php server using post method in WP8 app and get response in json format. I've tried everything that I found on stackoverflow and other sites, still could not.
The last code piece I come up with is:
public static async void GetData(string url, string data)
{
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.PostAsync(new Uri(url), new StringContent(data));
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();
MessageBox.Show(responseBody); // just showing the response for now
}
It shows a message from the server (which is an error stating some fields are missing) that it actually communicates with the server but the problem is with sending data. I call the above method like:
GetData("http_address_here", "?action=REGISTER&email=asc#fsdf.com&password=54561wefwe&firstname=sdfsdf&lastname=sdfsdf&picture=10");
But I saw an example sending data in xml. Possibly the mistake is about calling the method. Having seen tens of sample codes and trying everything, I really got confused about it. Any help is appreciated.

I finally managed to solve the problem. Thanks everyone for helping. The working code is below, it uses POST method and the resulting json object is stored as a string.
var values = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("email", "qewfwef"),
new KeyValuePair<string, string>("password", "qewfwef"),
new KeyValuePair<string, string>("firstname", "qewfwef"),
new KeyValuePair<string, string>("lastname", "qewfwef"),
new KeyValuePair<string, string>("picture", "123456")
};
var httpClient = new HttpClient(new HttpClientHandler());
HttpResponseMessage response = await httpClient.PostAsync(url, new FormUrlEncodedContent(values));
response.EnsureSuccessStatusCode();
var responseString = await response.Content.ReadAsStringAsync();
MessageBox.Show(responseString.ToString()); // just to see what we get

Can you try this
public static async Task<string> SendRequestPostResponse()
{
try
{
var postRequest = (HttpWebRequest)WebRequest.Create("your Url Here");
postRequest.ContentType = "application/x-www-form-urlencoded"; // Whichever content type you want to POST
postRequest.Method = "POST";
using (var requestStream = await postRequest.GetRequestStreamAsync())
{
byte[] postDataArray = Encoding.UTF8.GetBytes("your data here"); // Data for the POST request here
await requestStream.WriteAsync(postDataArray, 0, postDataArray.Length);
}
WebResponse postResponse = await postRequest.GetResponseAsync();
if (postResponse != null)
{
var postResponseStream = postResponse.GetResponseStream();
var postStreamReader = new StreamReader(postResponseStream);
string response = await postStreamReader.ReadToEndAsync();
return response;
}
return null;
}
}

HTTPWebRequest would be another alternative.