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https://nishantrana.me/2011/05/17/%e2%80%9cdropdownlist-has-a-selectedindex-which-is-invalid-because-it-does-not-exist-in-the-list-of-items%e2%80%9d-error-while-setting-selectedindex/
“DropDownList has a SelectedIndex which is invalid because it does not exist in the list of items” error while setting SelectedIndex