Hi Kevin,
Thanks for using Syncfusion products.
We have created a sample to illustrate populating items in ComboBoxAdv from the DataBase and storing the SelectedItems in the Database which you can download below.
Sample Link:
http://www.syncfusion.com/downloads/Support/DirectTrac/89588/F102524_ComboBoxDB-845047028.zip In this sample, we have used the Test DataBase contains Employee Table with data’s. Initially while loading the page we select the items which contains “S” in the Employee Name and selected in ComboBoxAdv using SelectedItems Property. After Custom Selection, we update the IsSelected value in Employee Table to “1” for selected Items by clicking Update SelectedItemTable button.
Please let us know if the sample helps.
Regards,
Surya Narayana