how to alert two admin works same database.

Question

in Asp.net web application.

in my application contains two admins.

ID	PRICE
1	100
2	200

Both admin are access the table in the same time.

if admin 1 update price 100 -150. save the data into the table.

now admin2 update same table 100-50.

in the above scenario admin2 update the above table then automatically send message "pleze refresh ur data".

how ?