How can I merge two strings and use them as a name?

For example: I want to sort through a a bunch of textboxes and refer them to certain cells. I know I can have a string "TextBox" and then the looping number "nbr" and merge them into for instance TextBox1.
But I can't figure out how to use this as a command. Like

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If the textboxes are on a worksheet ie embedded

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On a userform

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