vb.net - Program crashing Visual Basic -

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i programming in visual basic , have program created loan calculator. pretty have correct , works , operates way want too.

here code far:

public class form1

private minamt decimal = 1000 private maxamt decimal = 200000 private drate decimal private loan decimal  private sub form1_load(sender object, e eventargs) handles mybase.load     '== load rate , terms combo, 'click reset     r decimal = 0 0.1475 step 0.0025         '== add each successive value combo list         cbxrate.items.add(format(r, "00.00%"))     next     t byte = 12 120 step 6         cbxterm.items.add(format(t, "00"))     next     btnreset.performclick() end sub  private sub btnreset_click(sender object, e eventargs) handles btnreset.click     '== set defaults, , clear prior answers     cbxrate.text = "06.00%"     cbxterm.text = "36"     tbxloan.text = "10,000"     lblpayment.text = "" end sub  private sub btncalc_click(sender object, e eventargs) handles btncalc.click     '== validate loan amount (number 1,000 - 200,000);      if isnumeric(tbxloan.text) andalso tbxloan.text >= minamt andalso tbxloan.text <= maxamt         loan = tbxloan.text     else         messagebox.show("error invalid value")         tbxloan.focus()         tbxloan.selectall()     end if      '== calculate monthly payment pmt(monthly decimal rate, term in months, minus amount)     lblpayment.text = pmt(cbxrate.text.replace("%", "") / 1200, cbxterm.text, -tbxloan.text)      '== display formatted money: formatcurrency(blah blah blah)     lblpayment.text = formatcurrency(lblpayment.text, 2) end sub  private sub btnexit_click(sender object, e eventargs) handles btnexit.click     close()  end sub  private sub form1_formclosing(sender object, e formclosingeventargs) handles me.formclosing     '== confirm means it, else cancel attempt close.     if messagebox.show("do want exit?", "close", messageboxbuttons.yesno, messageboxicon.question) = windows.forms.dialogresult.yes     else         e.cancel = true     end if end sub

end class

i tried post picture of program easier, apparently don't have enough reputation points, ill try explain best can.

i eliminate problem of accidentally putting letter value in "enter loan amount" space. right if put letter "u" in "enter loan amount" space pop error (which want), crashes program (what don't want).

hopefully makes sense. able point me in right direction? still new visual basic.

thank you!

it's because you're continue calculate whatever or not input valid.

exit function using return after input invalid.

else     messagebox.show("error invalid value")     tbxloan.focus()     tbxloan.selectall()     return end if

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