how to open a login page

Answer 1

In wpf or wf you must create a Login form and a UserInfo class so then in a Button_click function take the inputs to validate the user looking into your database and if valid, give it to your UserInfo class and .Show() a new form, otherwise show some error message, that's pretty much the science of login

Answer 2

please ask clearly...what you need?

Answer 3

mm