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Editorial Team
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Asked: 2026-06-02T05:26:34+00:00

I have a data entry form, with its DataCountext bound to a ViewModel object.

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I have a data entry form, with its DataCountext bound to a ViewModel object.

The form contains (among other things) a number of CheckBox elements, each bound to a boolean in the ViewModel. These CheckBoxes are grouped into two GroupBoxes.

There are two business requirements I don’t know how to handle.

  1. At least one checkbox in groupbox 1 is selected, or at least one checkbox in groupbox 2 is selected.
  2. If anything in groupbox 1 is selected, everything in groupbox 2 is unselected, and vice versa.

Anyone have any ideas?

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1 Answer

  1. Editorial Team

    Solution for problem 1 is simple – have the Property setter in the VM clear the fields that should not be set. Binding will update the display appropriately.

    Solution for problem 2 is a bit more complicated. If I want to display an error at the GroupBox level, I need to attach a BindingGroup to the GroupBox, and add an appropriate ValidationRule to it.

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