Programmatically Utilize Textboxes In A Serial Manner?

let's say I create a basic windows form with 100 textboxes, and create a variable that starts at 0, and counts up to 100. How could I pseudo-effortlessly have, for example, textbox7, when the variable is at 7, display a piece of text, instead of writing 100 lines of code such as

if vara = 7 then textbox7.text = "hello"

is there a way to utilize something in the nature of LINQ, where you could somehow say,

if vara = 7 then textbox & varA & .text = "hello"

this is just an example, I know it will not work, after paying a small bit of attention to the likeliness and possibility.....