C# WPF IsEnabled using multiple bindings?

You can use a MultiBinding with a converter which implements IMultiValueConverter.

Just to give an answer you can (almost) copy&paste:

Static resource needed:

<converterNamespace:BooleanAndConverter x:Key="booleanAndConverter" />

The ComboBox:

<ComboBox Name="MyComboBox">  <ComboBox.IsEnabled>    <MultiBinding Converter="{StaticResource booleanAndConverter}">      <Binding ElementName="SomeCheckBox" Path="IsChecked" />      <Binding ElementName="AnotherCheckbox" Path="IsChecked"  />    </MultiBinding>  </ComboBox.IsEnabled></ComboBox>

The code for the converter:

namespace ConverterNamespace{    public class BooleanAndConverter : IMultiValueConverter    {        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)        {            foreach (object value in values)            {                if ((value is bool) && (bool)value == false)                {                    return false;                }            }            return true;        }        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)        {            throw new NotSupportedException("BooleanAndConverter is a OneWay converter.");        }    }}

You can also try shorter version of the same:

public class BooleanAndConverter : IMultiValueConverter{    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)    {        return values.OfType<IConvertible>().All(System.Convert.ToBoolean);    }    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)    {        throw new NotSupportedException();    }}public class BooleanOrConverter : IMultiValueConverter{    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)    {        return values.OfType<IConvertible>().Any(System.Convert.ToBoolean);    }    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)    {        throw new NotSupportedException();    }}

and, of course, you may need the converters for visibility, too:

public class BooleanOrToVisibilityConverter : IMultiValueConverter{    public Visibility HiddenVisibility { get; set; }    public bool IsInverted { get; set; }    public BooleanOrToVisibilityConverter()    {        HiddenVisibility = Visibility.Collapsed;        IsInverted = false;    }    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)    {        bool flag = values.OfType<IConvertible>().Any(System.Convert.ToBoolean);        if (IsInverted) flag = !flag;        return flag ? Visibility.Visible : HiddenVisibility;    }    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)    {        throw new NotImplementedException();    }}public class BooleanAndToVisibilityConverter : IMultiValueConverter{    public Visibility HiddenVisibility { get; set; }    public bool IsInverted { get; set; }    public BooleanAndToVisibilityConverter()    {        HiddenVisibility = Visibility.Collapsed;        IsInverted = false;    }    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)    {        bool flag = values.OfType<IConvertible>().All(System.Convert.ToBoolean);        if (IsInverted) flag = !flag;        return flag ? Visibility.Visible : HiddenVisibility;    }    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)    {        throw new NotImplementedException();    }}

I believe you may have to use a MultiBinding with a MultiValueConverter. See here: http://www.developingfor.net/wpf/multibinding-in-wpf.html

Here is a directly related example: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/5b9cd042-cacb-4aaa-9e17-2d615c44ee22