I'm trying to select the item in the Combobox based on the stored value in a Sorteddictionary
String value matching
comboBoxEdit3.SelectedItem = comboBoxEdit3.FindStringExact(Queries[_ucSetting.StandardSearchID.ToString()] + "(" + _ucSetting.StandardSearchID.ToString() + ")");
Elements in ComboBox
But this produces empty selection in the ComboBox
FindStringExact only returns the index of the first item that matches your string, or -1 if no match is found. You're trying to set the SelectedItem to the index being returned. You should set the SelectedIndex instead:
comboBoxEdit3.SelectedIndex = comboBoxEdit3.FindStringExact(Queries[_ucSetting.StandardSearchID.ToString()] + "(" + _ucSetting.StandardSearchID.ToString() + ")");