vb.net - VB code to Objective C -

im new coding in xcode , using objective c. have old code project written in vb wound convert objective c.

here code:

private sub vitalitybutton4_click(sender object, e eventargs) handles vitalitybutton4.click     if txtweburl.text <> nothing         try             dim wc new webclient             wc.proxy = nothing              dim st string = wc.downloadstring("http://isup.me/" & txtweburl.text)             if st.tolower.contains("it's not you!")                 txtwebstatus.text = "down!"             else                 txtwebstatus.text = "up!"             end if         catch ex exception             cse()         end try     end if end sub 

im making mac os x application, not ios.

there no magic way convert vb code obj-c, you'll have line line, means need learn objective-c.

here decent place start learning. apple provides lot of resources.