CS0117 C# 'Resource.Id' does not contain a definition for "PhoneNumberText"
<p>I use Visual Studio 2015 with Xamarin.
I'm naming my project "Phoneword"
I see this code such as tutorial/example on Xamarin's site.</p>

<p>The same error for <strong>TranslateButton</strong> and <strong>CallButton</strong> members.</p>

<p><strong>MainActivity.cs</strong> </p>

<pre><code>using System;
using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

namespace Phoneword
{
[Activity(Label = "Phoneword", MainLauncher = true)]
public class MainActivity : Activity
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.Main);

        // Our code will go here
        // Get our UI controls from the loaded layout:
        EditText phoneNumberText = (EditText)FindViewById(Resource.Id.PhoneNumberText);
        Button translateButton = FindViewById&lt;Button&gt;(Resource.Id.TranslateButton);
        Button callButton = FindViewById&lt;Button&gt;(Resource.Id.CallButton);

        // Disable the "Call" button
        callButton.Enabled = false;

        // Add code to translate number
        string translatedNumber = string.Empty;

        translateButton.Click += (object sender, EventArgs e) =&gt;
        {
            // Translate user's alphanumeric phone number to numeric
            translatedNumber = Core.PhonewordTranslator.ToNumber(phoneNumberText.Text);
            if (String.IsNullOrWhiteSpace(translatedNumber))
            {
                callButton.Text = "Call";
                callButton.Enabled = false;
            }
            else
            {
                callButton.Text = "Call " + translatedNumber;
                callButton.Enabled = true;
            }
        };

        callButton.Click += (object sender, EventArgs e) =&gt;
        {
            // On "Call" button click, try to dial phone number.
            var callDialog = new AlertDialog.Builder(this);
            callDialog.SetMessage("Call " + translatedNumber + "?");
            callDialog.SetNeutralButton("Call", delegate {
                // Create intent to dial phone
                var callIntent = new Intent(Intent.ActionCall);
                callIntent.SetData(Android.Net.Uri.Parse("tel:" + translatedNumber));
                StartActivity(callIntent);
            });
            callDialog.SetNegativeButton("Cancel", delegate { });

            // Show the alert dialog to the user and wait for response.
            callDialog.Show();
        };
    }

}
}
</code></pre>

<p><strong>Resource/Layout/Main.axml</strong></p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"&gt;
    &lt;TextView
        android:text="Enter a Phoneword"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textView1" /&gt;
    &lt;EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/PhoneNumberText"
        android:text="1-855-XAMARIN" /&gt;
    &lt;Button
        android:text="Translate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/TranslateButton" /&gt;
    &lt;Button
        android:text="Call"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/CallButton" /&gt;
&lt;/LinearLayout&gt;
</code></pre>

<p>I'm <strong>beginner</strong> in Android development, if you need other information i'll try to add more detail.
Please <strong>help me</strong></p>