How to use a textbox for a fortune teller in XAML?

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I am trying to do a fortune teller in XAML, but every time that I try to initiate a Textbox as an input for age and birth month, I failed and the it displays " <pre>The type 'TextBox' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built", Do I need to  declare something before? Thanks

This is the code

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="FortuneTeller.MainPage">

    <StackLayout>
        
        <Frame BackgroundColor="#2196F3" Padding="24" CornerRadius="0">
            <Label Text="Welcome to Fortune Teller" HorizontalTextAlignment="Center" TextColor="White" FontSize="36"/>
        </Frame>
        <Label Text="Enter your age, please" FontSize="Title" Padding="30,10,30,10"/>
        <TextBox></TextBox>
        <TextBox Width="500" Header="Notes" PlaceholderText="How old are you?"/>
        <Label Text="Enter your Birth Month, please" FontSize="Title" Padding="30,10,30,10"/>
        <TextBox Width="500" Header="Notes" PlaceholderText="What is your birth month?"/>
        <Label FontSize="16" Padding="30,24,30,0">
            <Label.FormattedText>
                <FormattedString>
                    <FormattedString.Spans>
                        <Span Text="Learn more at "/>
                        <Span Text="https://aka.ms/xamarin-quickstart" FontAttributes="Bold"/>
                    </FormattedString.Spans>
                </FormattedString>
            </Label.FormattedText>
        </Label>
        
    </StackLayout>

</ContentPage>

What I have tried:

Even when my XAML does not have initially this class, <pre><Window x:Class="WpfApp5.MainWindow" , I tried to add it, without success, either.

Posted 31-Oct-21 13:14pm

Diasalva5

Updated 1-Nov-21 22:55pm

v6

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CHill60 1-Nov-21 8:38am

Do you want to share the XAML where you are attempting to add the textbox?

Diasalva5 1-Nov-21 10:36am

Dear Chill60
What does "share the XAML" mean, please? Sorry, I am new in this world. Thanks

CHill60 1-Nov-21 12:40pm

I meant - include your XAML code in your question in the "What I have tried" section. As you are new here, there are a few techniques you need to know about...
- You can edit your question to add detail using the "Improve question" link at the bottom of your post
- To reply to a comment use the "Reply" link next to it - the poster will be notified that you have responded
- Never post a question or a comment in the "Add your solution here" area - use the "Have a Question or Comment?" link next to a question or a solution - again, the poster will be notified that you have responded.

I hope these tips help you get the most out of the site

Diasalva5 1-Nov-21 12:57pm

Dear Chill60
I have updated the question as per your advises. Sorry for the mistakes.
Thanks

[no name] 1-Nov-21 11:45am

Try a "DatePicker" control.

https://wpf-tutorial.com/misc-controls/the-datepicker-control/

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CHill60 · Answer 1 · 2021-11-01T22:55:00

It looks like you are using xamarin - in which case you probably want an Entry control - see Text in Xamarin.Forms - Xamarin | Microsoft Docs[^]

If you definitely want a TextBox then you need to include the appropriate namespaces as per the documentation - TextBox Overview - WPF .NET Framework | Microsoft Docs[^]

HTML

<Page  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackLayout>
  ...