WPF - binding to a specific element in a collection

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WPF

MVVM

data-binding

Hi dear experts ;)

In my WPF app, I have a class called Employee with 2 fields: FirstName, LastName.
In my view model, I have two bindable properties:

ObservableCollection<Employee> Employees;<br />
int CurrentIndex;

I want to bind a TextBlock on my view to the FirstName field of current employee; I've tested these syntaxs, but unfortunately none worked: :omg:

a) <TextBlock Text="{Binding Employees[CurrentIndex].FirstName}"/>
b) <TextBlock Text="{Binding Employees[{Binding CurrentIndex}].FirstName}"/>

Can you give me any solution?
I'm not sure but I think it's possible to use CollectionViewSource; but actually I prefer not to use it :laugh:

Thank you all in advance,
Cheers,
Siavash