I have a gridview, inside which one column comprises of a dropdownlistbox:
 HeaderText="Choose Employer" HeaderStyle-HorizontalAlign="Left" HeaderStyle-Width="15%">   runat="server" ID="cboEmployer" CssClass="textEntry" AutoPostBack="true" OnSelectedIndexChanged="cboEmployer_SelectedIndexChanged" onclick="javascript:shouldsubmit=false;" Width="80%">

Lets say the dropdown has some values like 'A','B' and 'C'.

My requirement is: on click of a button (outside the grid), I need to get the total number of rows for whichEmployer A is selected. How do I do this?