dependent controls in datalist

[sconard]

I.E.

There are two dropdown lists in a datalist itemTemplate.

dropDownList1 has two values 1, 2

dropDownList2 has two values A, B

 

On selectedIndexChange event of dropDownList1, I want to change the value selection of dropDownList2 to C, D and remove options A, B.

 

Remember: These controls only exist while datalist is in edit mode so I cannot just refer to the names of the controls in the code behind.

 

Does anyone have an asp.net example of how this can be done?