MdiForm problem

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C#2.0

C#

i have a 3 form in C#
form1 in mdiform,one menubar in form1
in form2 is one button.
in form3 is one label.
now when i load form1 i load form2 with form1's load event
such as form1 and form2 are load sametime
i write following code of click menubar in form1

<br />
form3 f=new form3();<br />
f.mdiparant=this;<br />
f.show();<br />

when i click menubar at runtime i show form3 in form1

now i want if i click button in form2 i show form3 in form1 and form2 are close

same condition of menubar click?

so what i do you do?

thanks in advance.