i am a newbiest on c# and window form
i am doing a web service, and use a form which contain a datagridview
but meet quite alot of problem
1. how to validate user input with database, like example, when the user insert a username, however the database have that data, i should prompt the user to enter another username
i try before in previous thread that i validate that particular column with only user can enter 0 or 1....
is it something similiar?
2. did i need a web method for this?cause i using web service to retrieve data