c# - set the value in textbox appears automatically -


i'm working on project now, make easier work decided make related textbox, question how set value of textbox appears automatically?

inthis case, rnol = pnol + qnol + nnol
want rnol value printed automatically in tbrnol/textbox rnol when click button.. 

        pnol = double.parse(tbpnol.text);         qnol = double.parse(tbqnol.text);         nnol = double.parse(tbnnol.text);         rnol = pnol + qnol + nnol(tbrnol.text); //i've try wrong syntax

you modify last line to:

rnol = pnol + qnol + nnol;

and add one:

tbrnol.text = rnol.tostring();

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