title: How to check whether the item in the combo box is selected or not in C#?
body: <p>I have a combo box in which I have to display the dates from a database. The user has to select a date from the combo box to proceed further, but I don't know how to make the user aware of selecting the item from the combo box first in order to proceed further.</p>
  
  <p>What process should be followed so that a user can get a message if he has not selected the date from the combo?</p>