wpf - Need a label to output a number. C# -

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i trying have label output monthly rate after has been calculated through formula. keep getting error when try output number.

double top = _principal * _interestrate / 1200.00; double bottom =( 1 - math.pow(1.0 + _interestrate / 1200.0, -12.0     _numberofyears)); double _monthlyrate = top / bottom; lblmonthlyrate  = _monthlyrate ("c");

thanks help!

lblmonthlyrate  = _monthlyrate ("c");

should (this windows forms):

lblmonthlyrate.text = _monthlyrate.tostring("c");

edit per update answer:

did lose reference system.web.ui.webcontrols?

edit 2:

i'm dummy. wpf? need (this wpf):

lblmonthlyrate.content = _montlyrate.tostring("c");

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