Vb net validating
Through brute force, such a program might be able to stumble upon a user's password, especially if the password is weak.
To prevent such brute force attacks, the Membership framework locks out a user if there are a certain number of unsuccessful login attempts within a certain period of time.
For the example, Suppose we need to validate entered data by user in above created Text Box, for it we need to Text Changed event of textbox1 so we use the Add Handler statement, Add Handler statement allow us to start event handling at any time during program execution means it associates an event with an event handler at run time.
Much like with creating user accounts, credentials can be validated programmatically or declaratively.
The Membership API includes a method for programmatically validating a user's credentials against the user store. NET ships with the Login Web control, which renders a user interface with textboxes for the username and password and a button to log in.
Unfortunately, there is no built-in tool for unlocking a user account.
In order to unlock an account, you can modify the database directly - change the table for the appropriate user account - or create a web-based interface that lists locked out accounts with options to unlock them.