WPF: reverting brush to default/original
default, user-controls, wpf
Solution
You could use
_textBox.ClearValue(TextBox.BorderBrushProperty);
That will remove the directly assigned value and go back to the value defined by the style or template.
Problem
I'm a complete newbie at WPF. At the moment I'm making a usercontrol for form elements called "LabeledTextbox" which contains a label, a textbox and a textblock for errormessages. When the using code adds an errormessage, I want to put the border of the textbox in red. But, when the errormessage gets removed, I'd like to turn back to the default bordercolor of the textbox. I feel there must be a very easy way to do this. My code: (in public partial class LabeledTextbox : UserControl) ``` public string ErrorMessage { set { if (string.IsNullOrEmpty(value)) { _textbox.BorderBrush = Brushes.Black; //How do I revert to the original color in the most elegant way? } else { _textbox.BorderBrush = Brushes.Red; } _errorMessage.Text = value; } } ```