increase the value of a textbox

Question

in a textbox1 enter the value as 50.

now i show the value as 1 in textbox2.

me enter  values as 

name   adress

celvchennai    (textbox2) as 1 again me enter the data  as

raj      madurai  (textbox2) as 3  again me enter the data  as

ravi     singapore    (textbox2) as 4 again me enter the data  as

ragu    sivagangai

vino    chennai

porkodi  trichy    (textbox2) as 50.

if i click the button again  i have to show the textbox as 1.

i need textbox1= textbox2.