Button Pressed Function on

ButtonPressed.cs

var client = new HttpClient();
var model = new FeedbackModel()
{
    Name = NameEntry.Text,
    Phone = PhoneEntry.Text,
    Email = EmailEntry.Text,
    Feedback = FeedbackEntry.Text
};
var uri = "{WebAppUrl}";
var jsonString = JsonConvert.SerializeObject(model);
var requestContent = new StringContent(jsonString);
var result = await client.PostAsync(uri, requestContent);
var resultContent = await result.Content.ReadAsStringAsync();
var response = JsonConvert.DeserializeObject<ResponseModel>(resultContent);