Force IDataErrorInfo validation

Question

I have two controls on some panel: textbox and combobox:

Answer 1

Just raise the NotifyPropertyChanged event for the property you want to validate or if you are in .NET 4.5 or Silverlight 4 use the INotityDataErrorInfo.

Answer 2

Worth remembering also that you can raise NotifyPropertyChanged with String.Empty property. This will force validation of all properties at that level. Can be useful at times.