Enable button based on TextBox value (WPF)

Question

This is MVVM application. There is a window and related view model class.

There is TextBox, Button and ListBox on form. Button is

Answer 1

Since you are using the DelegateCommand, you can call it's RaiseCanExecuteChanged method when your text property changes. I'm not sure what you are trying to accomplish with your CommandReference resource, but typically you just bind the commands directly to the button element's Command property:

This would be the relevant portion of your view model:

public string ObjectName
{
    get { return objectName; }
    set
    {
        if (value == objectName) return;
        value = objectName;
        AddObjectCommand.RaiseCanExecuteChanged();
        OnPropertyChanged("ObjectName");
    }
}