Hi Marina Vision,
Thank you for contacting us.
I would suggest that you use the RadDateTimePicker control for entering DateTime values. This control internally uses the RadMaskedEditBox control, but it also adds many additional features such as a popup calendar, null dates support, spin up/down behavior. It also allows you to put a range of available dates, etc.
When you set the current value of the RadDateTimePicker control to its NullDate, the control will display the value of the NullText property. Take a look at the following code snippet which sets the Value of the RadDateTimePicker control to NullDate:
this.radDateTimePicker2.NullText = "Null Text";
this.radDateTimePicker2.Value = this.radDateTimePicker2.NullDate;
The result of this is that the RadDateTimePicker control will display the "Null Text" in its text field. If the NullText property is set to an empty string, the control will display an empty string when the Value is equal to the NullDate.
As to your last question, RadDateTimePicker supports both masking DateTime types and empty strings.
Do do not hesitate to write back if you need more information or assistance.
the Telerik team
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