Looking for code to implement this simple asynchronous example -

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i'm looking simple example of asynchronous code ( preferable in vb .net ) this: 

main()  async sub1()  async sub2()  await sub1()  print "end" end  sub1()  n=1 1000   { }  next end sub  sub2()  if n=500 in sub1() print "hello" end sub

an alternative be:

main()  async sub1()  async sub2()  await sub1()  print "end" end  sub1()  n=1 1000   if n=500 send signal   { }  next end sub  sub2()  if signal received print "hello" end sub


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