The routine is an EventHandler that was bound to the TextChanged method.
Is it for the TextChanged method for all the text boxes
TextChanged implies
EventHandler(
object sender,
EventArgs e
);
Maybe you can 'for loop' through the array of control textboes until 'sender' equals and element in the array which can givr you index as well.
ie
for(int i=0; i < all_textboxes.count; i++)
{
if (all_textboxes[i].Equals(sender))
break;
}
Equals is usually a 'reference' check on objects to see if the same object (instance of a class) is present
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