Can I fire asp.net validation when using calender picker?

Question

Hi,

I am using a calender control with java script,date will be assigned to a text box when user picks the date from calender control. For the text box i am using date regularexpression validation.

I am entering wrong data in the textbox field,the validation was fired and displays a error message.then when i am picking the date from calender control the error message was still appearing on the screen.(below * is error message).

Here the validation is working fine when manually enters the date,but where as when iam picking up the date from calender control the the message remains on the page.as the regular behavoir of the validation controls, if the textbox value is valid the message should be disappear.

what i need to do in order to get this functionality?

please give me suggesion... thanks in Advance.