MVVM Light - usage of RaiseCanExecuteChanged for RelayCommand

I'm using MVVM Pattern. Im my View, I have textboxes for Person details, which one of them is idBox. Also, the view consists of several buttons, which one of them is editModeBtn.

I want the editModeBtn to be enabled only when there is a valid int inside the idBox.

My Xaml (within view) for the editBtn looks like the following:

<Buttonx:Name="editModeBtn"Content="Edit"Command="{Binding ChangeToEditScreenCommand}"CommandParameter="{Binding ElementName=idBox, Path=Text}"></Button>

In the corresponding viewModel, I have the following code:

privateRelayCommand<string> _changeToEditScreenCommand;publicRelayCommand<string>ChangeToEditScreenCommand{get{if(_changeToEditScreenCommand ==null){
                _changeToEditScreenCommand =newRelayCommand<string>((param)=>ChangeToEditScreen(param),(param)=>CanEdit(param));}return _changeToEditScreenCommand;}}

Also, in the CanExecute method (CanEdit in my case), I want to check if the parameter (id) is set to a valid int and then return true. False, otherwise.

privateboolCanEdit(string currentInsertedId){int idValue;bool result =Int32.TryParse(currentInsertedId,out idValue);if(result){if(idValue >0){returntrue;};returnfalse;}returnfalse;}

Basically, I want the canExecute method of the command to be invoked everytime something is written or removed from the idBox. Where should I put the RaiseCanExecuteChanged() of the command? If I haven't used MVVM, I could put it the textBox textChanged event, but this is not the case here. Never used the RaiseCanExecuteChanged, so just want to ensure. Thanks!