Example DNaaS API calls and workflow in C#

Dnaas.cs

using System;
using System.IO;
using System.Net.Http;
using System.Text;
using Newtonsoft.Json;

class Dnaas {
    private static readonly HttpClient client = new HttpClient {
        BaseAddress = new Uri("http://automation.berkeley.edu/dex-net-api/"),
    };

    static void Main(string[] args) {
        var jsonParams = JsonConvert.SerializeObject(new {
            metric = "robust_ferrari_canny",
                gripper = new {
                    fingertip_x = 0.01,
                        fingertip_y = 0.01,
                        gripper_offset = 0.01,
                        palm_depth = 0.05,
                        width = 0.08
                }
        });
        var jsonContent = new StringContent(jsonParams, Encoding.UTF8, "application/json");
        var meshContent = new ByteArrayContent(File.ReadAllBytes("/path/to/your/mesh.obj"));
        var form = new MultipartFormDataContent();

        form.Add(meshContent, "file", "file");
        form.Add(jsonContent, "params", "params");
        var response = client.PostAsync("upload-mesh", form)
            .GetAwaiter()
            .GetResult();

        response.EnsureSuccessStatusCode();
        var result = response.Content.ReadAsStringAsync().Result;
        Console.WriteLine(result);
    }
}

This is with your example and sample, same error...maybe I am doing something wrong..I am using this:
<?xml version="1.0" encoding="utf-8"?> <configuration> <startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/></startup></configuration>

static public void PostFromweb()
        {
           var jsonParams = JsonConvert.SerializeObject(new
            {
                metric = "robust_ferrari_canny",
                gripper = new
                {
                    fingertip_x = 0.01,
                    fingertip_y = 0.01,
                    gripper_offset = 0.01,
                    palm_depth = 0.05,
                    width = 0.08
                }
            });
            var jsonContent = new StringContent(jsonParams, Encoding.UTF8, "application/json");
            using (WebClient webClient = new WebClient())
            {
                string s = webClient.DownloadString("http://automation.berkeley.edu/dex-net/assets/pawn/pawn.obj");
                var bytes = System.Text.Encoding.UTF8.GetBytes(s);
                var meshContent = new ByteArrayContent(bytes);
                var form = new MultipartFormDataContent();

                form.Add(meshContent, "file", "file");
                form.Add(jsonContent, "params", "params");
                var uploadResponse = client.PostAsync("upload-mesh", form)
                    .GetAwaiter()
                    .GetResult();

                uploadResponse.EnsureSuccessStatusCode();
                var result = uploadResponse.Content.ReadAsStringAsync().Result;
                var anonResponse = new
                {
                    id = string.Empty,
                    position = -1
                };
                var deserializedResp = JsonConvert.DeserializeAnonymousType(result, anonResponse);
                Console.WriteLine(deserializedResp);
                var state = "preprocessing";
                while (state != "error" || state != "done")
                {
                    var progressResponse = client.GetAsync(deserializedResp.id + "/processing-progress")
                        .GetAwaiter()
                        .GetResult();
                    progressResponse.EnsureSuccessStatusCode();
                    var progress = progressResponse.Content.ReadAsStringAsync().Result;
                    Console.WriteLine(progress);
                    System.Threading.Thread.Sleep(5000);
                }
            }



        }

EDIT: After several clicks.... I have this output:
{
"state": "sampling grasps"
}

{
"percent done": 0.13,
"state": "collision checking"
}

The thread 0x2368 has exited with code 0 (0x0).
{
"percent done": 0.3175438596491228,
"state": "collision checking for stable poses"
}

{
"percent done": 0.010526315789473684,
"state": "computing metrics"
}

{
"percent done": 0.22105263157894736,
"state": "computing metrics"
}

{
"percent done": 0.4,
"state": "computing metrics"
}

{
"percent done": 0.6210526315789474,
"state": "computing metrics"
}

{
"percent done": 0.8421052631578947,
"state": "computing metrics"
}

{
"state": "done"
}

{
"state": "done"
}

{
"state": "done"
}
EDIT 2:

Adding this lines to your code works perfectly!
BTW: Beautiful project

 while (state != "error" || state != "done")
                {
                    var progressResponse = client.GetAsync(deserializedResp.id + "/processing-progress")
                        .GetAwaiter()
                        .GetResult();
                    progressResponse.EnsureSuccessStatusCode();
                    var progress = progressResponse.Content.ReadAsStringAsync().Result;
                    Console.WriteLine(progress);
                    if (progress.Contains("\"state\": \"done\""))
                    {
                 
                        break;
                    }
                    System.Threading.Thread.Sleep(5000);
                }

@DiegoVil sounds like you got things working. Glad to help.

@wderose : Yes , its working now...

One more question: I have gone through the paper but I have a doubt.... in the poses that you calculate where is the origin ? in the center of mass of the object? how can I know where is located the basis of coordinates?

The stable pose-associated grasp is relative to the object. We assume the mesh is watertight, so it should be the CoM of the object. In order to use grasp configuration, you may still need to apply a transformation to grasp pose. The quaternion is wxyz.