Drop default values

HI All,
I have problem in dropdownkey if I not select from the list how can get the default value.
I have done the coding below
ISimpleTypeModifiable myType =
               wdThis.wdGetAPI().getContext().getModifiableTypeOf("RoleKey");
          IModifiableSimpleValueSet values =
               myType.getSVServices().getModifiableSimpleValueSet();
values.put("key","values");
and so on.
I am retrieving the values
String rolekey =wdContext.currentContextElement().getRoleKey()
if i am not selecting from the drop down then I setting
if(rolekey.equals(""))
rolekey="NONE";
But I am not getting the NONE .
please help.

Hi Anil,
I was written like this aslo
my question is if I not select any key from dropdown
what it will retrun either "" or null key then i can compare with that value.
if(rolekey.length()==0 && rolekey.equals(""))
{ wdContext.currentContextElement().setRoleKey("NONE");
please help

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