vb.net - How do I enable a Calculate button in visual basic when i need 2 radio buttons selected and text in a text box -

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alright i'm writing program converts celsius kelvin , fahrenheit. default have calculate button disabled until user puts in temperature , selects radio button corresponding temperature , temperature being converted to. having great deal of issues trying enable calculate button. i'm not sure since nested if statements in calculate area not working. here have far:

option strict on option explicit on  public class fmmain     'yes understand program easy break      private sub btncalc_click(sender object, e eventargs) handles btncalc.click          try              dim num1 decimal             dim num2 decimal             dim answer decimal             dim flag integer             dim flag2 integer             dim t1 string              'this i'm trying enable calculate button             if txtnum1.text <> ""                 if radc1.checked or radf1.checked or radk1.checked                     if radc2.checked or radf2.checked or radk2.checked                         btncalc.enabled = true                         btncalc.focus()                     end if                 end if             end if               'this block of code makes sure input entered numerical , not break program.             if txtnum1.text <> "" 'i won't need line once can calculate button enabled , disabled @                 if isnumeric(txtnum1.text)                      if radf1.checked , radc2.checked                         flag = 1                     elseif radf1.checked , radk2.checked                         flag = 2                     elseif radc1.checked , radf2.checked                         flag = 3                     elseif radc1.checked , radk2.checked                         flag = 4                     elseif radk1.checked , radf2.checked                         flag = 5                     else                         flag = 6                     end if                      if radf2.checked                         flag2 = 1                     elseif radc2.checked                         flag2 = 2                     else                         flag2 = 3                     end if                      answer = modcalc.temperature(num1, flag, num2)                     t1 = modcalc.temp(flag2)                     messagebox.show("the answer is: " & answer.tostring & " " & t1 & ".", "this message box", messageboxbuttons.ok, messageboxicon.information)                  else                     messagebox.show("please enter number", "bad input error", messageboxbuttons.ok, messageboxicon.error)                 end if              else                 messagebox.show("please enter number", "bad input error", messageboxbuttons.ok, messageboxicon.error)             end if           catch ex exception          end try      end sub     'this ensures user can't click same radio button on both sides     private sub radf1_checkedchanged(sender object, e eventargs) handles radf1.checkedchanged         if radf1.checked             radf2.checked = false             radf2.enabled = false             radc2.enabled = true             radk2.enabled = true         end if     end sub      private sub radc1_checkedchanged(sender object, e eventargs) handles radc1.checkedchanged         if radc1.checked             radc2.checked = false             radc2.enabled = false             radf2.enabled = true             radk2.enabled = true         end if     end sub      private sub radk1_checkedchanged(sender object, e eventargs) handles radk1.checkedchanged         if radk1.checked             radk2.checked = false             radk2.enabled = false             radf2.enabled = true             radc2.enabled = true         end if     end sub  end class

one-liner:

btncalc.enabled = txtnum1.textlength > 0 andalso                   (radc1.checked orelse radf1.checked orelse radk1.checked) andalso                   (radc2.checked orelse radf2.checked orelse radk2.checked)

that said, how can enabling btncalc in own click event handler? need when state of other controls changes. click event can't raised if button isn't enabled.


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