>Hi, I have 2 questions:

It's better to create separate threads for unrelated questions. :)

>1. In the option menu, I set the resolution of Form to 800 x 600. But after I build my application to an exe file and run it, the size of the window is always 600 x 480, I always need to maximize it manually. I already set all of my forms to maximize in its property. My stupid workaround is make a window shortcut of this exe file and in the shortcut's property, I can set the default window size to maximum. Any way to solve this problem?
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The setting in the Option menu doesn't affect the size of the specific form it just limits max size of the form you can set. If you wan you application to start maximazied then set WindowState property of _screen object in your main program

_Screen.WindowState = 2