Add string in to a code from textbox

See more:

C#

TextBoxBase

Does c# can do if i adding string from textbox then the string will be write in a code.

example:
Hide   Copy Code
mylist.Add(new string[] {""});

when i type "banana" from textbox and i clik save it will add or update automaticly from the code.
it become like this.
 
Hide   Copy Code
mylist.Add(new string[] {"banana"});


thank you somuch.

What I have tried:

I tried with mylist.add(new string[]{""};