textbox values with sum display to other form

hi,

if i enterd values in textbox1 in form1 like below
1
2
3
4
i used textbox2 for sum of textbox1
textbox1 value not fix 4 numers it may be 7 or 10 whatever user enterd inputs

so i want to get help for your for display user enterd values with sum in other form2
like
1
2
3
4
----
10
----
plz help for code