Question : Enable Disable Drop Down

Hi Experts,
I want to enable/disable a drop down on C#.  I am able to do it in Java Script.  But, I need to do it on C# too during page load and on click of Submit button.  Below is my code.  I have three drop downs.  I need to enable the 3rd drop down i.e. id="OrgUnit" if WorkCountry = "DE" selected. For other countries, it should be disabled.  Please advice.  
Thank you in advance.


<html>
      <head>
            <script type="text/javascript">
            function makeDisable(){
                  var x=document.getElementById("mySelect")
                  x.disabled=true
            }
            function makeEnable(){
                  var x=document.getElementById("mySelect")
                  x.disabled=false
            }
            function EnableOrgUnit(){
                  var x=document.getElementById("WorkCountry")
                  var y=document.getElementById("lblOrgUnit")
                  var z=document.getElementById("OrgUnit")
                alert('Working: ' + x.value);
                  if (x.value == "DE")
                  {
                        y.disabled=false
                        z.disabled=false
                  }
                  else
                  {
                        y.disabled=true
                        z.disabled=true
                  }
            }
            </script>
      </head>
      <body>
            <table cellSpacing="0" cellPadding="0" width="400" border="0">
                  <form id="Form1" runat="server">
                        <TBODY>
                              <tr>
                                    <td>
                                          <asp:dropdownlist id="mySelect" tabIndex="15" runat="server" Width="150px">
                                                <asp:ListItem Value="Apple" Selected="True">Apple</asp:ListItem>
                                                <asp:ListItem Value="Banana">Banana</asp:ListItem>
                                                <asp:ListItem Value="Orange">Orange</asp:ListItem>
                                          </asp:dropdownlist>
                                    </td>
                                    <td><input type="button" onclick="makeDisable()" value="Disable list"></td>
                                    <td><input type="button" onclick="makeEnable()" value="Enable List"></td>
                              </tr>
                              <tr>
                                    <td width="118" style="WIDTH: 118px"><FONT class="label">Work Country:</FONT><span class="requiredField">&nbsp;*</span></td>
                                    <td width="70%"><asp:dropdownlist class="Required" id="WorkCountry" tabIndex="14" runat="server" Width="120px" onchange="EnableOrgUnit();">
                                                <asp:ListItem Value="No Selection" Selected="True">--- Select one ---</asp:ListItem>
                                                <asp:ListItem Value="US">US</asp:ListItem>
                                                <asp:ListItem Value="DE">DE</asp:ListItem>
                                          </asp:dropdownlist></td>
                              </tr>
                              <tr>
                                    <td width="118" style="WIDTH: 118px"><span class="requiredField">
                                                <asp:Label id="lblOrgUnit" runat="server" Font-Bold="True" ForeColor="#1A659E">Org Unit:</asp:Label></span></td>
                                    <td width="70%"><asp:dropdownlist id="OrgUnit" tabIndex="15" runat="server" Width="150px">
                                                <asp:ListItem Value="No Selection" Selected="True">--- Select one ---</asp:ListItem>
                                                <asp:ListItem Value="Aerospace Lubeck">Aerospace Lubeck</asp:ListItem>
                                                <asp:ListItem Value="Aerospace Hamburg">Aerospace Hamburg</asp:ListItem>
                                                <asp:ListItem Value="Aerospace Finkenwerder">Aerospace Finkenwerder</asp:ListItem>
                                          </asp:dropdownlist></td>
                              </tr>
                  </form>
                  </TBODY>
            </table>
      </body>
</html>

Answer : Enable Disable Drop Down

or use

dropdown.Enabled=false;
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