How to send values to web api from windows application

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WebAPI

ASP.NET-Core

hi Friends,

I am sending values from windows application to net core web api.

I am not receiving values in the API.

Getting json deserialize error

Is there any alternative to send values to post api from windows applications?

What I have tried:

Windows application code :

WebClient client = new WebClient();

               client.BaseAddress = "http://test.com";
               var url = "/api/Customers/add";
               client.Headers["Content-type"] = "application/json";
               string StoreName = ConfigurationManager.AppSettings["StoreName"];
               List<Customersinfo> bills = new List<Customersinfo>();

               foreach (DataRow dr in dt.Rows)
               {

               Customersinfo Bill = new Customersinfo();
               Bill.Storename = StoreName;

               bills.Add(Bill);
              }

               string data = JsonConvert.SerializeObject(bills);
               var response = client.UploadString(url, data);

               var result = JsonConvert.DeserializeObject<Customersinfo>(response);

.net API:

[HttpPost]
        [Route("add")]
        public async Task<ObjectResult> AddCustomer([FromBody] List<Customersinfo> custinfo)
        {
            try
            {
                if (custinfo.Count > 0)
                {
					//Here I am not getting the data to insert into the database
				}
				
				}
				}