Question

I have Textbox with blue Background and white Foreground. When entering a text my whole Textbox becomes white and i cannot see what i am typing because im writing white letters on white background. How to change background of a textbox when writing to i.e. blue?

Answer 1

Add the GotFocus event handler to the TextBox like this.

private void TextBox_GotFocus(object sender, RoutedEventArgs e)
    {
        (sender as TextBox).Background = new SolidColorBrush(Colors.Blue);
    }