how to keep track of previous value before changing it in vb.net -

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 private sub chkloop_checkedchanged(sender object, e eventargs) handles chkloop.checkedchanged     intvalue1 = nudx4.value     intvalue2 = nudy4.value     dim g triglib.triglib = new triglib.triglib     ' make shape closed making last point same first point.      if chkloop.checked         nudx4.value = nudx1.value         nudy4.value = nudy1.value          lblarea.text = "area: " & cint(g.areatriangle(new point(nudx1.value, nudy1.value), new point(nudx2.value, nudy2.value), new point(nudx3.value, nudy3.value)))     elseif chkloop.checkstate = checkstate.unchecked         nudx4.value = intvalue1         nudy4.value = intvalue2         lblarea.text = ""

i trying store previous values of point nudx4 , nudy4 in 2 local variable. when uncheck checkbox values of nudx4 , nudy4 remain equal values of nudx1 , nudy1 instead of changing previous values.

please help.

private sub chkloop_checkedchanged(sender object, e eventargs) handles chkloop.checkedchanged     if chkloop.checked         ...         intvalue1 = nudx4.value         intvalue2 = nudy4.value     elseif chkloop.checkstate = checkstate.unchecked         nudx4.value = intvalue1         nudy4.value = intvalue2        ...

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