Programatically get sharepoint List Internal Name of Column

private static string InternalColumnName(SPList oList, string NameColumn)
        {
            string LookupCoumn = string.Empty;
            try
            {
                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    SPFieldCollection oFieldCollection = oList.Fields;
                    foreach (SPField oField in oFieldCollection)
                    {
                        if (oField.Type == SPFieldType.Lookup)
                        {
                            SPFieldLookup spl = (SPFieldLookup)oField;
                            if (spl.LookupField.Equals(ResourceNameColumn))
                                LookupCoumn = spl.InternalName;
                            if (spl.RelatedField.Equals(ResourceNameColumn))
                                LookupCoumn = spl.InternalName;

                        }
                    }
                });
            }
            catch (Exception)
            { }
            return LookupCoumn;
        }