---

---

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public static async Task<T>PostAsync<T>(string BaseUrl, string EndpointName, object InputParams)
{
    try
    {
        var client = new HttpClient();
        client.BaseAddress = new Uri(BaseUrl);
        var inputjason = JsonConvert.SerializeObject(InputParams);
        var content = new StringContent(inputjason, Encoding.UTF8, "application/json");
        var response = await client.PostAsync(EndpointName, content);
        if (response.StatusCode == HttpStatusCode.OK)
        {
            var json = await response.Content.ReadAsStringAsync();

            var result = JsonConvert.DeserializeObject<T>(json);
            return result;
        }
        return default(T);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
        return default(T);
    }
}
//---------------------------------------------------------------------------------------------------------------
public class ResultEntity
{
    public bool ResultValue { get; set; }
    public string ResultMessage { get; set; }
}
//---------------------------------------------------------------------------------------------------------------
public class InputEntity
{
    public string UserName { get; set; }
    public string Password { get; set; }
    public string MobileNumber { get; set; }
    public string Message { get; set; }
}
//---------------------------------------------------------------------------------------------------------------
public static class CallExternalServices
{
    public static ResultEntity SendSms(string MobileNumber, string Message)
    {
        string url = "http://sms.alis.ir/sms";        <------------------- Enter URL here
        InputEntity inputEntity = new InputEntity()
        {
            UserName = "username", <------------------- Enter UserName here
            Password = "password", <------------------- Enter Password here
            MobileNumber = MobileNumber,
            Message = Message
        };
        ResultEntity response = PostAsync<ResultEntity>(url, "Send", inputEntity).GetAwaiter().GetResult();
        return response;
    }
}