Question

I have to do complex calculations on every textchange event of a WPF textbox , Is there any similar event ?

Answer 1

you can make use of Binding for that and make sure sure any change to the bound item gets triggered:

<TextBox Text="{Binding Path=X, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

and then in your viewModel you can do calculations based on that change (your ViewModel should implement INotifyPropertyChanged:

public int MyProperty
        {
            get
            {
                return myVar ;
            }
            set
            {
                myVar = value;
                OnPropertyChanged("MyProperty") ;

                //Fire off calculation in another thread in here

            }
        }