Help making a focus timer app(help make the timer countdown)

public partial class MainPage : ContentPage

{

private System.Timers.Timer \_timer;

private int count = 0;



public MainPage()

{

InitializeComponent();

}

void Main()

{

\_timer = new System.Timers.Timer();

//trigger event every second

\_timer.Interval = 1000;

\_timer.Elapsed += OnTimedEvent;

​

}

private void OnTimedEvent(object sender, EventArgs e) {

count--;

\_timer.Enabled = true;

​

TimerLabel.Text = count.ToString();

if (count==0)

{

\_timer.Stop();

}

}

private void IncrementCounterClicked(object sender, EventArgs e)

{

count++;

TimerLabel.Text = count.ToString();

}

private void IncrementCounterClicked\_1(object sender, EventArgs e)

{



count+=5;

TimerLabel.Text = count.ToString();

}

private void ClearClicked(object sender, EventArgs e)

{

​

count = 0;

TimerLabel.Text = count.ToString();

}

}

}

**And my main page:**

​

<Label Text="00:00"

HorizontalOptions="Center"

FontSize="Title"

x:Name="TimerLabel"

TextColor="Silver"





\> </Label>

<Button Text="Start"

Clicked="OnTimedEvent"

FontSize="Body"

WidthRequest="80"

BackgroundColor="CornflowerBlue"

HorizontalOptions="Center"



\></Button>

​

<Button Text="+1"

Clicked="IncrementCounterClicked"

FontSize="Body"

WidthRequest="50"

BackgroundColor="CornflowerBlue"

HorizontalOptions="Center"



\></Button>



<Button Text="+5"

Clicked="IncrementCounterClicked\_1"

FontSize="Body"

WidthRequest="50"

BackgroundColor="CornflowerBlue"

HorizontalOptions="Center"

\></Button>



<Button Text="Clear"

Clicked="ClearClicked"

FontSize="Body"

WidthRequest="80"

BackgroundColor="CornflowerBlue"

HorizontalOptions="Center"

\></Button>

</StackLayout>

Ive really got no idea how to get it working or what to do. Im stuck and ive no idea where to find help