Hi Grzesiek,
I am not sure what is causing the error in your solution. This is why I attached a sample project demonstrating how to limit the
MaskedInput control input to only positive numbers.
Let me know if it works for you or if I can further assist you.
Greetings,
Tina Stancheva
the Telerik team
Sharpen your .NET Ninja skills! Attend Q1 webinar week and get a chance to win a license!
Book your seat now >>