Vb .NET multiple filesystemwatch instances

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VB

I'm using the following code to monitor a folder using Filesystemwatch

Dim foldertowatch as New FileSystemWatcher()
foldertowatch.Path = source_folder

                With foldertowatch
                    'File type
                    .Filter = source_prefix & "*." & source_file_type
                    'Notify Filter
                    .NotifyFilter = .NotifyFilter Or NotifyFilters.FileName
                    .NotifyFilter = .NotifyFilter Or NotifyFilters.DirectoryName
                    'To watch sub directories....
                    .IncludeSubdirectories = sub_folder
                    'Handle new file created
                    AddHandler .Created, AddressOf Process

                    .EnableRaisingEvents = True
                End With

And using the below sub to handle the created event

Private Sub Process(ByVal Source As Object, ByVal evt As FileSystemEventArgs)
'To do...
End Sub

Now it comes to a point where I need to monitor multiple folders, each folder with different file types, and different processes need to do. For example

Source 1 - Monitor pdf file when created - To Do: Rename and save to Destination 1
Source 2 - Monitor txt file when created - To Do: Rename and save to Destination 2
Source 3 - Monitor excel file when created - To Do: Rename and save to Destination 3
and so on...

What I have tried:

I tried to created multi instances of Filesystemwatch

Dim foldertowatch(total_items) As FileSystemWatcher
        For i = 0 To 10
            foldertowatch(i) = New FileSystemWatcher()

            foldertowatch(i).Path = source(i)

                With foldertowatch(i)
                    'File type
                    .Filter = source_prefix(i) & "*." & source_file_type(i)
                    'Notify Filter
                    .NotifyFilter = .NotifyFilter Or NotifyFilters.FileName
                    .NotifyFilter = .NotifyFilter Or NotifyFilters.DirectoryName
                    'To watch sub directories....
                    .IncludeSubdirectories = sub_folder(i)
                    'Handle new file created
                    AddHandler .Created, AddressOf Process

                    .EnableRaisingEvents = True
                End With
        Next

But I don't know how to handle the events raised from different instances. Basically, How do I know which instance raises the event so that to proceed with rename/save to correct folder.