Xamarin custom renderer take photo - xamarin

Question

I want to take photo using Xamarin form custom renderer.
I use Custom Renderer Sample and I add a Button named 'btnTakePicture' in Xaml , but I don't have any idea how to take photo on Button click event.
I want to show camera in part of screen.
Also I checked Xam.Media.Plugin and I couldn't take photo.
Xaml Code
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:CustomRenderer;assembly=CustomRenderer"
x:Class="CustomRenderer.frmCamera"
Title="Main Page">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="1*"/>
<RowDefinition Height="7*"/>
<RowDefinition Height="2*"/>
</Grid.RowDefinitions>
<Grid Grid.Row="0">
<Label Text="Camera Preview"/>
</Grid>
<Grid Grid.Row="1">
<local:CameraPreview Camera="Rear" x:Name="cmrPreview"
HorizontalOptions="FillAndExpand"
VerticalOptions="FillAndExpand" Background="black"/>
</Grid>
<Grid Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="1*"/>
</Grid.ColumnDefinitions>
<Button x:Name="btnChangeCamera" Text="Switch Camera" Clicked="btnChangeCamera_Clicked"/>
<Button x:Name="btnTakePicture" Text="Take" Grid.Column="1" Clicked="btnTakePicture_Clicked"/>
</Grid>
<Frame></Frame>
</Grid>
</ContentPage>
C# Code
using System.IO;
using Xamarin.Essentials;
using Xamarin.Forms;
namespace CustomRenderer
{
public partial class frmCamera : ContentPage
{
public frmCamera()
{
InitializeComponent();
}
private void btnChangeCamera_Clicked(object sender, System.EventArgs e)
{
if (cmrPreview.Camera == CameraOptions.Rear)
cmrPreview.Camera = CameraOptions.Front;
else
cmrPreview.Camera = CameraOptions.Rear;
}
bool blnIsFlashLight = false;
private void btnFlashLight_Clicked(object sender, System.EventArgs e)
{
if (blnIsFlashLight)
{
Flashlight.TurnOffAsync();
blnIsFlashLight = false;
}
else
{
Flashlight.TurnOnAsync();
blnIsFlashLight = true;
}
}
private void btnTakePhoto_Clicked(object sender, System.EventArgs e)
{
}
}
}
here is my project Screenshot