ms access - about field update using function with case -

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i'm trying update field value depending 2 string field using function if , case, function below:

private function checkdati(tipotransazione string, tipovendita string) string  dim r string r = "" if tipotransazione = "vendita"     select case tipovendita         case "armi"             if me.txtmatricola = "" r = "matricola"             if me.txtmodello = "" r = "modello"             if me.txtcalibro = "" r = "calibro"             if me.txttipoarma = "" r = "tipo arma"             if me.txtfabrica = "" r = "fabbrica"         case "vendita armi/munizioni"         case "munizioni"     end select end if  if tipotransazione = "acquisto"     select case tipovendita         case "armi"             if me.txtmatricola = "" r = "matricola"             if me.txtmodello = "" r = "modello"             if me.txtcalibro = "" r = "calibro"             if me.txttipoarma = "" r = "tipo arma"             if me.txtfabrica = "" r = "fabbrica"         case "vendita armi/munizioni"         case "munizioni"     end select end if  checkdati = r  end function

and when call function in command button event as:

msgbox (checkdati(me.causalemov, me.txt_tipomov))

it's not updating field. wrong?

when say: 

if me.txtmatricola = "" r = "matricola"

what doing assigning value: "matricola" variable:r. instead think want this: 

if me.txtmatricola = "" me.txtmatricola  = "matricola"

this sets value of field: txtmatricola "matricola". goes of fields in case statements.


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