How do I detect whether text is overflowing/not fitting in the text box?

I want to detect dynamically whether the text set to text box is fitting inside it or it is overflowing and rest of the text is invisible

Try this:

Save TextBox.TextHeight to a variable.

Temporarily increase textbox height (for example to 1000px) and save TextBox.TextHeight to another variable, then revert textbox to its original height.

Compare two variables. If their values are the same, then the text fits. If the second value is bigger, it means the text doesn't fit.

Brillant !!! Thanks Buddy !!!