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copied!<p>Another way to do this is using a MultiBinding and Converter on the button you want to enable/disable</p> <pre><code><Window ... xmlns:local="..."> <Window.Resources> <local:MyMultiValueConverter x:Key="MyMultiValueConverter" /> </Window.Resources> ... <ComboBox x:Name="myComboBox">...</ComboBox> <TextBox x:Name="myTextBox">...</TextBox> ... <Button Content="My Button"> <Button.IsEnabled> <MultiBinding Converter="{StaticResource MyMultiValueConverter}"> <Binding ElementName="myComboBox" Path="SelectedValue" /> <Binding ElementName="myTextBox" Path="Text" /> </MultiBinding> </Button.IsEnabled> </Button> ... </Window> </code></pre> <p>You need to create an implementation of the <a href="http://msdn.microsoft.com/en-us/library/system.windows.data.imultivalueconverter.aspx" rel="nofollow">IMultiValueConverter interface</a> that tests the values of both the ComboBox.SelectedValue and TextBox.Text properties and return either true or false which will then be assigned to the Button.IsEnabled property. Here's a simple converter that works but you'd want to make sure to tailor one to your specific needs:</p> <pre><code>public class MyMultiValueConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (values == null) return false; return values.All(c => c is String ? !String.IsNullOrEmpty((string)c) : c != null); } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } </code></pre> <p>While this approach does work, I tend to agree with the other answers in that you should use commands when possible over multibindings and converters.</p>

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