updating all data in one row sql server vb.net

Question

im using vb.net 2005 and sql server 2005
i want to update all data in one row in one click button in vb.net
for example

stock | last_stock  
1        2   
1        3
1        4

if i click update button in my vb.net project it becomes

stock | last_stock  
2        2   
3        3
4        4

all i know is update single data, please help
i try with

update barang set (stock) ='" &textbox1.text& "' where barang.id_barang = transaksi.id_barang

Answer 1

Without WHERE clause UPDATE will affect all rows in your table

UPDATE barang SET stock = last_stock

Here is SQLFiddle demo