I have a situation where I have an IList<T> collection of objects bound to a datagrid. I have one property, name, bound to a DataGridTextColumn. I want to enforce the rule that name should be unique within the collection and was wondering what might
be the best way to do it.
Most of the validation examples I've seen either validate a single cell or else validate a row, allowing you to compare several values within the same row. But I need to validate the value of a single cell based on the values in the entire collection.
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