UPDATE operation in cascading drop down list

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ASP.NET4

I have created 3 list e.g. Country, State, Cities. I have populated them successfully & have sent selected value to the database table.

But during update operation as I have fetched the values of respective columns/fields, system is unable to find the selected values except the 'Country' drop down list. As it has been populating at page_load and rest of two are blank because no change has made to it. And I am trying to Select the value/item selected previously (during save/insert operation).

I am confused how could I bind the state and cities list on the value of Country available in the dataset.

Please suggest some ways.

Thanks you!