How to stop my 4 buttons answer last item of dictionary?

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XAML

Button

I have created a dictionary of 4 keywords on xaml visual studio 2019: int, bool, etc. Each keywords has its own value: hello, hello1, etc. However, when pressing these keywords, instead of answer its own values, they always answer the last one of the last keyword, hello3, not its corresponding one, Why? Any idea, please? Thanks

  <?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="Dictionary.MainPage">
    <StackLayout Orientation="Horizontal">
        <Frame BackgroundColor="Cyan" Padding="0" CornerRadius="0">
            <Label Text="Welcome to KeyWords in C#!" 
                  
                  VerticalTextAlignment="Start" 
                   TextColor="Blue" 
                   FontSize="20"/>
        </Frame>
        <Frame BackgroundColor="#2196F3" Padding="0" CornerRadius="0">
            <Label Text="Click on Buttons!" 
                  
                   HorizontalTextAlignment="Center" 
                   TextColor="DarkRed" 
                   FontSize="20"/>
        </Frame>
        <Label x:Name="valuelabel"
               Text="myInventory!"                  
               HorizontalTextAlignment="Center" 
               TextColor="DarkRed" 
               
                   FontSize="Medium"/>

        <Button Text="int"
               
               Clicked="Button_Clicked"
                 Margin="3"              
            
                VerticalOptions="Center"
                FontSize="Large"
              
                TextColor="Blue"/>
        
        <Button Text="if"
                   
                Clicked="Button_Clicked"
                 Margin="2"              
                 HorizontalOptions="Start"
               
                FontSize="Large"
                TextColor="Blue"/>
        
        <Button Text="bool"
                   
                Clicked="Button_Clicked"
                 Margin="3"              
                 HorizontalOptions="Start"
                
                FontSize="Large"
                TextColor="Blue"/>
        
        <Button Text="class"
                   
                Clicked="Button_Clicked"
                 Margin="4"              
                 HorizontalOptions="Center"
              
                FontSize="Large"
                TextColor="Blue"/>
        
        

    </StackLayout>
    
    
    
</ContentPage>

C# Version

using System.Threading.Tasks;
using Xamarin.Forms;


namespace Dictionary
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
            Button button = new Button
            {

                HorizontalOptions = LayoutOptions.Center,
                VerticalOptions = LayoutOptions.Center

            };

            button.Clicked += async (sender, args) =>
            {
                await Navigation.PushAsync(new MainPage());

            };

           
            
            //Content = button;

        }
        
        private void Button_Clicked(object sender, EventArgs args)
        {
            Dictionary<string, string=""> myInventory = new Dictionary<string, string="">();
            myInventory.Add("int", "Hello ");
            myInventory.Add("if", "hello1");
            myInventory.Add("bool", "hello2");
            myInventory.Add("class", "hello3");
            valuelabel.Text =($"{myInventory["int"]}");
            valuelabel.Text = ($"{myInventory["if"]}");
            valuelabel.Text = ($"{myInventory["bool"]}");
            valuelabel.Text = ($"{myInventory["class"]}");
   
          
            
        }
    }
    
}

What I have tried:

I have tried to create click handler for each one of the buttons and I have tried to change the names for each one of the buttons, and it doesn't work. Any ideas, please?