vb.net - Showing a specific result within a loop -

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i'm trying create program able encode using rsa encrypt system. i've created code able calculate using euclidean algorithm. here's code: 

private sub button2_click(byval sender system.object, byval e system.eventargs) handles button2.click     number1 = textbox1.text     number2 = textbox2.text     while answer <> 0         answer = number1 mod number2         number2 = number1 , answer = number2     loop     messagebox.show(answer) end sub

so, that's nothing difficult, right? problem show 0 answer, makes sense. want have answer of loop before last one.

here [example]

enter image description here

if don't understand i'm trying say.

i hope able me :)

    private sub button2_click(byval sender system.object, byval e                                                            system.eventargs) handles button2.click         dim prevanswer integer         number1 = textbox1.text         number2 = textbox2.text         while answer <> 0             prevanswer = answer             answer = number1 mod number2             number2 = number1 , answer = number2         loop     messagebox.show(prevanswer)     end sub

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