Hi Inger Marie,
Such functionality is not currently available for RadNumericUpDown. However if the values are constantly increasing you can use SmallChange
property and set it to something bigger than 1. For example if you have 4,8,12,16 set SmallChange=4 and you are set.
Now to your second question. You can set IsEditable= false and that will make the TextBox of the control read only.
Hope this helps. If you have further questions please let me know.
the Telerik team
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