Why dont you set up a language master table and bind your dropdownlist with it & Use asp:Dropdownlist instead of select.
OR
Simply,
List<string> s = new List<String>();
s.Add(LanguageResources.CommonStrings.ALERT_HDR_ACCOUNTNO);
s.Add(LanguageResources.CommonStrings.ALERT_HDR_ACC);
s.Add(LanguageResources.CommonStrings.ALERT_HDR_ACCOUNT);
s.Add(LanguageResources.CommonStrings.ALERT_HDR_NO);
Bind this list to dropdown.