XAML - Change Label Text inside Viewcell from code behind

Hi everybody,
I need to change a label text put into a Viewcell from codebehind but I receive an error dispayng "the name likecount does not exist in the current context".

I want to show the label value initially(like count), it is working.

  <ListView x:Name="ListView1"  RowHeight="500">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>

        <Label 
            Text="{Binding likeCount}"
            x:Name="likecount" 
            Font="14" 
            TextColor="Black"
            HorizontalOptions="Start" 
            VerticalOptions="Center"/>  

                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

After like or unlike i want to change the label text(like count). For that i use the following code:

If(like){
 likecount.Text = item.likeCount + 1;
 } else{
 likecount.Text = item.likeCount - 1;
 }

Currently showing, The name likecount does not exist in the current context.

Can you show how you create the datamodel?

Please help me, Thanks in advance.