Error on GETidLocation Listings FunctionSystem.InvalidCastException: Specified cast is not valid. at Location.getLocationID(String city, String state)System.ArgumentException: Error on GETidLocation Listings FunctionSystem.InvalidCastException: Specified cast is not valid. at Location.getLocationID(String city, String state) at Location.getLocationID(String city, String state) at StateData.Page_Load(Object sender, EventArgs e) in http://server/UserControl/StateData.ascx.cs:line 87