在表单A之前启动表单B.为什么表单A看不到用户身份验证信息？

Simple synopsis: I have a program which needs authentication from user to get access or create file with user name and password. I have form A and form B; form A is a main window of my program which have a button pointing to form B, which is log in form. As of right now I must launch form A, and then click a button to go to form B because of necessary log in access to the files. My program is recognizing if person has logged in and it enables buttons that let me create a new file or access already created one (they are disabled by default, and only are enabled if authentication was first successful).Simple synopsis: I have a program which needs a