Using ASP.NET to post API form-data C#

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NameValueCollection _params = new NameValueCollection();

_params.Add("Request[title]", "عرض جديد شركة محمد النهدى العقارية");
_params.Add("Request[description]", "شقة بحى البندرية عمارة اللؤلؤة");
_params.Add("Request[type]", "شقة");
_params.Add("Request[request_type]", "FOR_RENT");
_params.Add("Request[price_from]", "20000");
_params.Add("Request[price_to]", "35000");
_params.Add("Request[area_from]", "100");
_params.Add("Request[area_to]", "150");

string sPostURL = "https://test.com/api/saveRequest";

var wbClient = new WebClient();

wbClient.Headers.Add("Content-Type", "application/form-data");

wbClient.Headers.Add("token", "9665840");

var response = wbClient.UploadValues(sPostURL, "Post", _params);

Error Messege

The Content-Type header cannot be changed from its default value for this request.'

What I have tried:

Error Messege <pre>The Content-Type header cannot be changed from its default value for this request.'

Posted 17-Apr-20 12:58pm

haythamsoft

Updated 17-Apr-20 13:34pm

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MadMyche · Answer 1 · 2020-04-17T13:35:00

First thing to note is that WebClient is kinda old and is not recommended for new development, instead you should be using HttpClient

Important
We don't recommend that you use the WebClient class for new development. Instead, use the System.Net.Http.HttpClient class.

References:
WebClient Class (System.Net) | Microsoft Docs[^]
HttpClient Class (System.Net.Http) | Microsoft Docs[^]

The second to note is that no matter which client you are using, it is only the transit mechanism to send the HTTP Request and to receive the HTTP Response.
What you need to do is to set the header the actual request; and not on the client handling the request.
Microsoft has a good sample for this as well, complete with setting the headers
How to: Send data by using the WebRequest class | Microsoft Docs[^]