I need a vb6 to vb.net translation dictionary

in vb 6, i was able to control object of form from other forms. ex:

form1 obj:
label
text box
button

form2 obj:
label
text box
button


while in form 2:
form1.testbox.text = "sdfasjfla"

while in form 1:
form2.testbox.text = "sdfasjfla"


how do you do that is vb .net