Have you heard of “Comparer.OrdinalIgnoreCase”?
If the answer is “No” (or something similar), you will be very delighted to hear that this is your key to disable case sensitivity in comparing operations.
So if you want to check if a substring like “car” is contained somewhere, you can write:
Text.Contains(MyText, "car", Comparer.OrdinalIgnoreCase)
and the expression will return true for all cases of car like: CAR, Car, caR… .
The official documentation looks like this: