Write some Software

I have a web site developed in Visual Studio using VB.NET. The attached has an aspx page with nested datalists. I am passing a clientid via querystring. That loads the first datalist with the clients ProductCategories including a column ProductCategoryID. There is a second datalist that should load the clients ProductSubCategories by the ProductCategoryID. The third datalist should load the ProductItems by the ProductSubCategoryID. I have the first datalist populating, but am stuck setting the databinding for the second and third nested datalists. This should only be a few line of code to bind the list.