add data in textbox

 i  have one textbox  and one button

 

 

 

 

i put value first in this textbox (ex: 1234)

 

it added and show in another textbox

 

 

output like that:

 

(ex:

1. 1234)

 

 

again i added the valur in the textbox ( txtPrevPol)( ex :3456)

 

 

show it in the txtPrevPolList

output:

 

1. 1234

2. 3456 ) 

 

i am doing this using the following script: