Keep getting this error: The event 'System.Windows.Controls.Primitives.ToggleButton.Checked' can only appear on the left hand side of += or -=

Question

I keep getting this error when making the program as given below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Sys         


        

Answer 1

Checked here is an event, not a bool, that happens when it is checked. You need a different property - presumably IsChecked.

Minor note, but stylistically, it is usually preferable not to compare booleans to true/false, but rather:

        if (rbadd.IsChecked)
            c = a + b;
        else if (rbsubtract.IsChecked)
            c = a - b;
        else if (rbdivide.IsChecked)
            c = a / b;

etc; or if you wanted to test for false: if(!rbadd.IsChecked).