vb.net - New control vs control -

is new control needed create control or can 1 use control? example:

dim label1 label vs dim label1 label= new label

question 1:

here made reference;

 dim label1 label  

you can't use 1 jet, won't work;

 label1.text = "yadda" 

you error like; object not instance of declaring class

here made reference plus instance;

 dim label1 label= new label 

you can use instance;

 label1.text = "yadde" 

in .net 'control' not variable, it's class; http://msdn.microsoft.com/en-us/library/system.windows.forms.control.aspx

question 2:

if put control on form, , change it, change on form! don't have add them again form!

question 3:

controls.remove method of form, example;

 form1.controls.remove(label1) 

you need refer form1 inside own class 'me' ;

 me.controls.remove(label1) 

it detaches control form, stil there.

if want 'remove' should,

    me.controls.remove(label1)     label1.dispose()