RegisterValidation

        private async void btnNext_Clicked(object sender, EventArgs e)
        {
            try
            {
                HttpClient client = new HttpClient();
                var response = await client.GetStringAsync("http://ipoladroid01-001-site1.btempurl.com/Restserver/index.php/users/view");
                var user = JsonConvert.DeserializeObject<List<Users>>(response);

                for (int i = 0; i < user.Count; i++)
                {
                    if (entUsername.Text == user[i].mem_acc_username)
                    {
                        _continue = false;
                        DisplayAlert("Notice", "This username is already used please choose another.", "OK");

                        entUsername.Focus();


                    }
                    else
                    {
                        _continue = true;
                    }


                }


                if (_continue == true)
                {

                    if (entUsername.Text == null || entUsername.Text == "")
                    {
                        DisplayAlert("Notice", "Please input your desire username.", "OK");
                    }
                    else
                    {
                        if (entUsername.Text.Length < 8)
                        {
                            DisplayAlert("Notice", "Username must include 8-32 characters", "OK");
                        }
                        else
                        {
                            if (entPassword.Text == null || entPassword.Text == "")
                            {
                                DisplayAlert("Notice", "Please input your desire password.", "OK");
                            }
                            else
                            {
                                if (entPassword.Text.Length < 8)
                                {
                                    DisplayAlert("Notice", "Password must include 8-45 characters", "OK");
                                }
                                else
                                {
                                    if (entFname.Text == null || entFname.Text == "")
                                    {
                                        DisplayAlert("Notice", "Please input your Firstname.", "OK");
                                    }
                                    else
                                    {
                                        if (entLname.Text == null || entLname.Text == "")
                                        {
                                            DisplayAlert("Notice", "Please input your Password", "OK");
                                        }
                                        else
                                        {
                                            tempusername = entUsername.Text;
                                            temppassword = entPassword.Text;
                                            tempfname = entFname.Text;
                                            templname = entLname.Text;

                                            var u = new Users();
                                            u.mem_acc_username = tempusername;
                                            u.mem_acc_password = temppassword;

                                            u.mem_fname = tempfname;
                                            u.mem_lname = templname;

                                            var page1 = new Registration2(u);


                                            Navigation.PushAsync(page1);
                                            _continue = false;
                                        }
                                    }
                                }
                            }
                        }

                    }

                }
                else
                {
                    DisplayAlert("Notice", "Something went wrong please try again.", "OK");

                }
            }
            catch(Exception ex)
            {
                DisplayAlert("Network error", "Please check your internet connection and try again.", "OK");
            }



        }


///// Reg 2



  private async void btnRegister_Clicked(object sender, EventArgs e)
        {

            if (entAddress.Text == null | entAddress.Text == "")
            {
                DisplayAlert("Notice", "Please fill-up your current address.", "OK");
                entAddress.Focus();
            }
            else
            {
                if (entContact.Text == null || entContact.Text == "")

                {

                    DisplayAlert("Notice", "Please input your phone number", "OK");
                }
                else
                {
                    if (entContact.Text.Length < 11 )
                    {
                        DisplayAlert("Notice", "Enter a valid phone number", "OK");
                    }
                    else
                    {
                        Users users = new Users()
                        {

                            mem_acc_username = tempusername,
                            mem_acc_password = temppassword,
                            mem_fname = tempfname,
                            mem_lname = templname,
                            mem_address = entAddress.Text,
                            mem_mobile_no = entContact.Text,
                            mem_bday = dateselected


                        };

                        var page2 = new Registration3(users);


                        Navigation.PushAsync(page2);

                    }

                }
            }

        }



//// Reg 3


        private async Task btnRegister_Clicked(object sender, EventArgs e)
        {

            try
            {
                if (entBirth.SelectedIndex < 0)
                {
                    DisplayAlert("Notice", "Please select a Security Question", "OK");
                }
                else
                {
                    if(entAnswer.Text == null || entAnswer.Text == "")
                    {
                        DisplayAlert("Notice", "Please input your answer", "OK");
                        entAnswer.Focus();
                    }
                    else
                    {
                        if(ent5digit.Text == null || ent5digit.Text == "")
                        {
                            DisplayAlert("Notice", "Please input your membership code, if you don't have membership code feel free to contact us.", "OK");
                        }
                        else
                        {
                            btnRegister.IsEnabled = false;
                            Send5Digit sendthis = new Send5Digit()
                            {
                                membership_code = ent5digit.Text
                            };



                            var json1 = JsonConvert.SerializeObject(sendthis);

                            var content1 = new StringContent(json1, Encoding.UTF8, "application/json");


                            HttpClient client1 = new HttpClient();

                            var result1 = await client1.PostAsync("http://ipoladroid01-001-site1.btempurl.com/Restserver/index.php/customer/search_codes", content1);
                            // var result1 = await client1.PostAsync("http://192.168.43.178/Restserver/index.php/customer/search_codes", content1);
                            response = await result1.Content.ReadAsStringAsync();
                            //  await  DisplayAlert("Debug", response, "OK");
                            if (response == "[]")
                            {
                                await DisplayAlert("Notice", "Invalid Code", "OK");
                                btnRegister.IsEnabled = true;
                            }
                            else
                            {
                                var validator = JsonConvert.DeserializeObject<List<Send5Digit>>(response);
                                var memcode = validator[0].membership_code;
                                var code = validator[0].code_number;
                                var stat = validator[0].code_status;


                                await DisplayAlert("Debug", memcode + code + stat, "OK");


                                Send5Digit codez = new Send5Digit()
                                {
                                    code_number = code
                                };


                                var json2 = JsonConvert.SerializeObject(codez);

                                var content2 = new StringContent(json2, Encoding.UTF8, "application/json");


                                HttpClient client2 = new HttpClient();

                                var result2 = await client1.PostAsync("http://ipoladroid01-001-site1.btempurl.com/Restserver/index.php/customer/update_registered_codes", content2);
                                //  var result2 = await client1.PostAsync("http://192.168.43.178/Restserver/index.php/customer/update_registered_codes", content2);
                                if (result2.StatusCode == System.Net.HttpStatusCode.Created)
                                {
                                    Users users = new Users()
                                    {

                                        mem_acc_username = tempmem_acc_username,
                                        mem_acc_password = tempmem_acc_password,
                                        mem_question = temp,
                                        mem_answer = entAnswer.Text,
                                        mem_fname = tempmem_fname,
                                        mem_lname = tempmem_lname,
                                        mem_address = tempmem_address,
                                        mem_mobile_no = tempmem_mobile,
                                        mem_bday = tempmem_bday,
                                    };



                                    var json = JsonConvert.SerializeObject(users);



                                    var content = new StringContent(json, Encoding.UTF8, "application/json");


                                    HttpClient client = new HttpClient();

                                    var result = await client.PostAsync("http://ipoladroid01-001-site1.btempurl.com/Restserver/index.php/users/insert", content);


                                    //  var result = await client.PostAsync("http://192.168.43.178/Restserver/index.php/users/insert", content);


                                    if (result.StatusCode == System.Net.HttpStatusCode.Created)
                                    {
                                        await DisplayAlert("Success :", "Account Registered", "OK");
                                        btnRegister.IsEnabled = true;
                                        Navigation.PushAsync(new MainPage());
                                    }
                                    else
                                    {
                                        await DisplayAlert("Failed", result.ToString(), "OK");

                                        btnRegister.IsEnabled = true;
                                    }
                                }


                                else
                                {
                                    await DisplayAlert("Failed", result2.ToString(), "OK");


                                }


                            }
                        }
                    }
                }


            }
            catch (Exception ex)
            {
                DisplayAlert("Hmmmm", "Something went wrong please try again later.", "OK");
            }

        }