title: RestSharp post request - Body with x-www-form-urlencoded values
body: <p>I am using postman and making an api post request where I am adding body with x-www-form-urlencoded key/values and it works fine in postman.</p>
  
  <p>The issue arrises when I try it from c# using RestSharp package.</p>
  
  <p>I have tried the following code below but not getting the response. I get "BadRequest" invalid_client error.</p>
  
  <pre><code>public class ClientConfig {
      public string client_id { get; set; } = "value here";
      public string grant_type { get; set; } = "value here";
      public string client_secret { get; set; } = "value here";
      public string scope { get; set; } = "value here";
      public string response_type { get; set; } = "value here";
  }
  
  public void GetResponse() {
          var client = new RestClient("api-url-here");
          var req = new RestRequest("endpoint-here",Method.POST);
          var config = new ClientConfig();//values to pass in request
  
          req.AddHeader("Content-Type","application/x-www-form-urlencoded");
          req.AddParameter("application/x-www-form-urlencoded",config,ParameterType.RequestBody);
  
          var res = client.Execute(req);
          return;
      }
  
  //Also tried this
  
      req.AddParameter("client_id",config.client_id,"application/x-www-form-urlencoded",ParameterType.RequestBody);
                  req.AddParameter("grant_type",config.grant_type,"application/x-www-form-urlencoded",ParameterType.RequestBody);
                  req.AddParameter("client_secret",config.client_secret,"application/x-www-form-urlencoded",ParameterType.RequestBody);
                  req.AddParameter("scope",config.scope,ParameterType.RequestBody);
                  req.AddParameter("response_type",config.response_type,"application/x-www-form-urlencoded",ParameterType.RequestBody);
  
  //tried this too
  var client = new RestClient("url-here");
              var req = new RestRequest("endpointhere",Method.POST);
              var config = new ClientConfig();
  req.AddBody(config);
  var res = client.Execute(req);
  </code></pre>