How to make HTTP post request in c#.net using form data

See more:

C#

Unexpected character encountered while parsing value: H. Path '', line 0, position 0 Newtonsoft.Json.JsonReaderException

What I have tried:

string title = TextBox1.Text;
string description = TextBox2.Text;
string unitType = ddlUnitType.SelectedValue;
string RequestType = ddlRequestType.SelectedValue;
string pricefrom = txtpricefrom.Text;
string priceto = txtpriceto.Text;
string areafrom = txtAreafrom.Text;
string areato = txtAreato.Text;
string Send_Data = String.Format("request[title]={0}&request[description]={1}&request[type]={2}&request[request_type]={3}&request[price_from]={4}&request[price_to]={5}&request[area_from]={6}&request[area_to]={7}", title, description,unitType,RequestType,pricefrom,priceto,areafrom,areato);

string url = "https://test.com/api/saveRequest?" + Send_Data;
string Requestbody = "";

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";

request.Headers.Add("token", "222222");


System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
Byte[] byteArray = encoding.GetBytes(Requestbody);
request.ContentLength = byteArray.Length;
// request.ContentType = @"application/form-data";
request.ContentType = @"application/json";
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;



using (Stream data = request.GetRequestStream())
{
data.Write(byteArray, 0, byteArray.Length);
}

IAsyncResult asyncResult = request.BeginGetResponse(null, null);
asyncResult.AsyncWaitHandle.WaitOne();

using (WebResponse webResponse = request.EndGetResponse(asyncResult))
{
using (StreamReader rd = new StreamReader(webResponse.GetResponseStream()))
{
var result = rd.ReadToEnd();


dynamic _json = JsonConvert.DeserializeObject(result);
dynamic _result = new ExpandoObject();
var all_data = _json["status"];

if (all_data == "true")
{
lblmessege.Text = "Saved";

}

else
{
lblmessege.Text = "Not Saved";
}