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To handle the below cases, need to provide a new API to handle the display mask character when focusing on the component.
When we use the [Phone] attribute for phone number validation, it will consider the null values. Which means that if we provide the empty string it consider as null. Hence validation will not happening for this case. This works as expected in MaskedTextBox if we did not provide the mask property. If we provide the mask property, it throws the validation message like “Phone number is required” for empty strings also.