How to insert string or int from textbox to array c#

Assuming that you want to add some value to a list of string or int, check this:

List<int> intList = new List<int>
intList.Add(1);
intList.Add(100);

List<string> stringList = new List<string>
stringList.Add("new string");
stringList.Add("other string");

For further information, please see: List(T) Class (System.Collections.Generic)[^]

thank you for answer my question.i am sorry i was wrong to deklare my problem.i mean Does c# can do if i adding string from textbox then the string will be write in a code.

example:

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.

mylist.Add(new string[] {"banana"});

thank you somuch.