set datepicker to null on selecting a combo box

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ASP.NET

Javascript

hi I need to set the date picker value to null , if i select a particular item in my combo box.
for eg:
if my combo box have item a,b,c
if i select item b,then the value in the date picker should be set to null.
the coding has to be done client side using javascript or jquery.
by setting datepicker to null i mean empty the datepicker.