Let's assume you have prepared your FileSystemWatcher1
with these properties
Dim FileSystemWatcher1 = New FileSystemWatcher()
FileSystemWatcher1.Path = "C:\"
FileSystemWatcher1.Filter = "*.*"
AddHandler FileSystemWatcher1.Created, AddressOf OnCreated
FileSystemWatcher1.EnableRaisingEvents = True
.....
Then you could write your event handler as you have already done above and look at the property of the FileSystemEventArgs
argument passed to the event handler to know the exact name of the file created.
Private Shared Sub OnCreated(source As Object, e As FileSystemEventArgs)
If e.Name.ToUpper() == "MYTEXTFILE.TXT" then
' do you code here '
End If
End Sub