Hi I am facing the same problem, I get error notifications in radMaskedTextBox for every button click and its frustrating us.
After using the following code I get other problems, when I place the cursor in the text box all the spaces given in the display mask is removed and after entering the numbers. the numbers which I entered is hidden on blur.
"(_ _ _)_ _ _ -_ _ _ _"
Please give me a correct solution.
We have to show the format like this
"(_ _ _)_ _ _ -_ _ _ _". It should work in such a way that as given promptchar="_ " and at the same time the radMaskedtextbox should not show error notification on post back.
Thanks & regards