Hi,

You can easily get the DatePicker's current value, compare it with your valid date range and display an error message if needed by JavaScript. An example demonstrating this can be found here:

http://www.essentialobjects.com/Demo/Default.aspx?path=Calendar\_i2\_i0

The difficult part is when to call such validation code. The easiest approach is to call it before you submit the page. For example, if you have a "Save" button that submits the page, you can attach an onclick JavaScript handler to your "Save" button. You can then perform the validation and return false inside that handler. A more sophisticated method is to handle the validation when the DatePicker control loses focus. In another word, you would handle the DatePicker's onblur event instead of your "Save" button's onclick event. You can find details about this approach at here:

http://www.essentialobjects.com/Forum/Default.aspx?g=posts&t=1888

Hope this helps. Please feel free to let us know if you have any more questions.

Thanks