problem with javascript and reload page
i have two problem
1. how to call a javascript function from form page and also how to
call c# function from javascript because when user click on button i
want to validate field of form and if validation is correct then call
to c# function .
please any no about this reply
2. in second i have button when i click on button a calender shown and
i collect date but problem is when i click on button i page reload , i
want to stop reloading of page
in coding i set the value of calender visible true
please any body no about answer reply me