How to use Linq to find the right item in ItemsControl.Items?

Your result currently is an IEnumerable() where t1. IsChecked select t1. Content).Single().ToString() Also t1.

IsChecked is already boolean, no need to compare it with true.

Your result currently is an IEnumerable that has one element (the content of the one checked radio button) - but you just need this one element itself, for that you can use Single(): string str = ( from t1 in itemsControl.Items.OfType() where t1. IsChecked select t1. Content).Single().ToString(); Also t1.

IsChecked is already boolean, no need to compare it with true.

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