AJAX CascadingDropdown extender control provides the functionality to load the data in ASP.Net dropdown list controls using AJAX based web service methods. AJAX CascadingDropdown extender works with 2 or more Dropdownlist controls that enable you to load the primary data in first dropdown and further it populates the second Dropdown list control dynamically with related data on selected index change event of first dropdownlist.
All this functionality performs without refreshing the ASP.Net web page. In this sample we have used the Northwind SQL Database to load the category names in first Dropdownlist control that will populate the related products into the second dropdownlist control accroding to the category name selected.
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