CascadingDropDownList - Adding KnownCategoryValues through code

I am using several Cascading Drop Down Lists.

Is there a way that I can add values to the knownCategoryValues and category parameters that get passed to the webmethods?

For example:

[

WebMethod(EnableSession =true)]
publicCascadingDropDownNameValue[] GetSkill(
string knownCategoryValues,
string category)
{
int SubSystem_ID =int.Parse(Session["PageSubSystem"].ToString());
StringDictionary kv =CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);

int Location_ID;
if (!kv.ContainsKey("Location") || !int.TryParse(kv["Location"],out Location_ID))
{
returnnull;
}

Sorry for the badly formatted code, but the Code Entry thing is not working.

Anyway, how would I add a "Key" of Location to the parameters? Would this have to be in the WebService, or can I add it from the web page?

Any help on this would be greatly appreciated!

Try to take a look at the following link about how to useAjax:CascadingDropDown with a Database for reference.
http://ajax.alpascual.com/Walkthrough/CCDWithDB.aspx
Wish this can help you.