PersianCalendar pc = new PersianCalendar();

HttpClient client = new HttpClient();
var request = new CallBackSaleReportViewModel
{
    RRN = model.RRN,
    OrderId = model.OrderId,
    Token = model.Token,
    FromDate = new DateTime(Convert.ToInt32(model.FromDate.Split('/')[0]), Convert.ToInt32(model.FromDate.Split('/')[1]), Convert.ToInt32(model.FromDate.Split('/')[2]), pc),
    ToDate = new DateTime(Convert.ToInt32(model.ToDate.Split('/')[0]), Convert.ToInt32(model.ToDate.Split('/')[1]), Convert.ToInt32(model.ToDate.Split('/')[2]), pc)
};
Uri baseAddressUri = new Uri("https://pgwservices.pec.ir/api/PGWReport/GetSaleReport",
UriKind.Absolute);
string authParams = string.Format("{0}|{1}", model.Username, model.Password);
byte[] bytes = Encoding.UTF8.GetBytes(authParams);
string encodedAuthParams = Convert.ToBase64String(bytes);
client.DefaultRequestHeaders.Authorization = new
AuthenticationHeaderValue(AuthenticationSchemes.Basic.ToString(), encodedAuthParams);
client.DefaultRequestHeaders.Add("apiVersion", "1.0");
var requestJson = JsonConvert.SerializeObject(request);
HttpContent queryString = new StringContent(requestJson, Encoding.UTF8, "application/json");
HttpResponseMessage resp = null;
resp = client.PostAsync(baseAddressUri, queryString).Result;
string result = null;
if (resp.IsSuccessStatusCode)
{
                    result = resp.Content.ReadAsStringAsync().Result;
                    var obj = Newtonsoft.Json.JsonConvert.DeserializeObject(result);
                    result = Newtonsoft.Json.JsonConvert.SerializeObject(obj, Newtonsoft.Json.Formatting.Indented);
}
else
                    result = resp.ReasonPhrase;

ViewBag.Result = result;