How to fire tap event of image button in Xamarin

Design Side  

<Image  x:Name="imgThumbnail"  HorizontalOptions="FillAndExpand"   VerticalOptions="FillAndExpand"     Aspect="AspectFill"   >
  <Image.GestureRecognizers >
    <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped">
    </TapGestureRecognizer>
  </Image.GestureRecognizers>
</Image>

Coding Side

private void TapGestureRecognizer_Tapped(object sender, EventArgs e)
{
          // Handle Event
}