Thank you for writing.
Currently, you can determine whether the entered text is valid by manually checking it. Here is an example to change if the entered text is valid for the Email
sender, CancelEventArgs e)
valid = (radMaskedEditBox1.MaskedEditBoxElement.Provider
We are currently working on improving this behavior in order to be more user friendly.
I hope that you find this information helpful. Should you have any other questions, do not hesitate to contact us.
the Telerik team
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