thx for you reply me first

In this time , you said i only need to add the A.vb file ...
Then i just new the project and add exiting item,but the studio none of create the two file,
i don't complier the program , it will show the error .....
And the Form top name A.vb , not a A.vb [Design]
This form is not view desinger button ......
i already rebuild , but not ok , i want to see the interface