In this asp .net tutorial we will learn how to implement JQUERY Autosize to resize our textarea or multiline textbox as text inside multiline textbox increases. For this tutorial I'll use awesome Jquery Autosize plugin built by Jack Moore. This Autosize plugin has two option to increase textbox height as per text grows. 

1) Autosize with CSS transition.

2) Autosize with no animation. 

We will implement both the effects in this tutorial.