MaskedTextBox doesn't work with MaxLength validation when the mask is at least as long as the maxlength. More details could be found in [this ](https://feedback.telerik.com/kendo-jquery-ui/1576344-maskedtextbox-doesn-t-work-with-maxlength-validation-when-the-mask-is-atleast-as-long-as-the-maxlength)item.