How to show result on button click in Xamarin - xamarin

Question

Consider me a very beginner App developer who has not developed anything so far :)
I like to "number"x2 (multiply by 2) shows up in front of "result" after clicking "Calculation" button.
also, how can I show the result on another page/screen?
here is a pic of the app
enter image description here
here is my code:
MainPage.xaml
<StackLayout>
<Label
Text="Give me a number"
Margin="0,50,0,0" Padding="13,0,0,0"/>
<Entry Placeholder="number"
x:Name="numb"
Keyboard="Numeric"
Margin="130,-30,40,0"
Opacity="1" Rotation="0"
TranslationX="16" />
<Button Text=" Calculate "
BackgroundColor="#F6DEDE"
FontSize="Large"
FontAttributes="Bold"
/>
<Label
Text=" Result "
FontSize="30"
Margin="0, 20, 0, 0"
Padding="10,0,0,0"/>
</StackLayout>
Here is MainPage.xaml.cs:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace Test
{
[DesignTimeVisible(false)]
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
void CalculateClicked(object sender, EventArgs args)
{
float numb = float.Parse(this.numb.Text);
float B = 100 * numb * 2;
// show B in front of result or on another page
}
}
}

Answer 1

first, give a name to your Label
<Label x:Name="result"
Text=" Result "
FontSize="30"
Margin="0, 20, 0, 0"
Padding="10,0,0,0"/>
Now, you have to set the result in the label
void CalculateClicked(object sender, EventArgs args)
{
float numb = float.Parse(this.numb.Text);
float B = 100 * numb * 2;
result.Text = $": {B}";
}

Answer 2

As the two answers already points out, you need to give a name to the label in xaml and then you can use it in code behind to set the text.
void CalculateClicked(object sender, EventArgs args)
{
float numb = float.Parse(this.numb.Text);
float B = 100 * numb * 2;
// show B in front of result or on another page
resultLabel.Text = B.ToString();
}
Another thing you need to do is add a click event to the button and assign CalculateClicked to it. Then when you click the button, CalculateClicked method will be triggered:
<Button Text=" Calculate "
BackgroundColor="#F6DEDE"
FontSize="Large"
FontAttributes="Bold"
Clicked="CalculateClicked"
/>

Answer 3

first, give your Label a name
<Label x:Name="lblResult"
Text=" Result "
FontSize="30"
Margin="0, 20, 0, 0"
Padding="10,0,0,0"/>
then you can assign it a value from code
void CalculateClicked(object sender, EventArgs args)
{
float numb = float.Parse(this.numb.Text);
float B = 100 * numb * 2;
// show B in front of result or on another page
lblResult.Text += ": " + B.ToString();
}