How to setup simple data binding in c# [duplicate]

Your problem is that you are trying to bind to a Method instead of a property. Try something like this:

public static bool fruitLimits
{
    get
    { /*your method code here*/ }
}

EDIT: There is no way to pass arguments into the Property, so if you don't have access to the values of the text box you may have to write a converter that gets these values passed. Here the basics: link You can pass one object as the value and the other as the parameter. The converter then processes the information and returns a bool. Here an example of what the Binding of this Converter should look like:

Here an example, your binding should look something like this:

                <DataTrigger Value="True">
                    <DataTrigger.Binding>
                        <MultiBinding Converter="{StaticResource converterKey}">
                            <Binding ElementName="boxVariable" />
                            <Binding ElementName="textboxDec" Path="Text" />
                        </MultiBinding>
                    </DataTrigger.Binding>

Replace the "ElementName=boxVariable" and "ElementName=textboxDec" with the names of the controls you want to pass. You may have to add "Path=Text" on the textbox binding.

Then in the IMultiValueConverter do something like this:

public object Convert(object[] value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    if (value[0].GetType().Equals(typeof(ComboBox)) && value[1].GetType().Equals(typeof(String)))
    { 
        ComboBox boxVariable = value[0] as ComboBox;
        string textboxDec = value[1] as String;

        /* your method code here, returns Boolean */
    }
}