vb.net - VB how to input string Convert to characters upper and Lower -

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in vb how can input string convert characters upper , lower input ' hello' output 'hello' code thiis 

  sub convertcase()         dim integer = 0         dim inputval string = textbox1.text         dim out string = label1.text         while > inputval.length()             if inputval.length() mod 2 = 0                 out = inputval.substring(0, 1).toupper             end if             if inputval.length() mod 2 <> 0                 out = inputval.substring(1).tolower             end if             loop         label1.text &= out     end sub

i don't know what's wrong ><

you there. needed append out

out &= ...

and substring wasn't done properly.

    integer = 0 inputval.length - 1         if (i mod 2) = 0             out &= char.toupper(inputval(i))         else             out &= char.tolower(inputval(i))         end if     next

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