Check if object is NOT of type (!= equivalent for "IS") - C#

This is one way:

if (!(sender is TextBox)) {...}

Couldn't you also do the more verbose "old" way, before the is keyword:

if (sender.GetType() != typeof(TextBox)) { // ... }

C# 9 allows using the not operator. You can just use

if (sender is not TextBox) {...}

instead of

if (!(sender is TextBox)) {...}

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