AjaxDropdown

a dropdown which can be bound to one or more controls, it changes it's list of options when the value of a parent control is changed, besides values of the parent controls parameters with predefined values can be set (all these values are sent to a server-side method that returns the list of options)

simple AjaxDropdown

bound to one dropdown by parentId

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bound to 2 dropdowns by using Data

and
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bound to Multilookup

    bound to a simple TextBox

    write 1 or 2 or ... 5

    Send "Parameters" with predefined values

    [1,2,3,4,5,6,7] + selected value ...