System.Data.ProviderBase.FieldNameLookup.IndexOf C# (CSharp) Method

        public int IndexOf(string fieldName)
        {
            if (null == _fieldNameLookup)
            {
                GenerateLookup();
            }
            int index;
            object value = _fieldNameLookup[fieldName];
            if (null != value)
            {
                // via case sensitive search, first match with lowest ordinal matches
                index = (int)value;
            }
            else
            {
                // via case insensitive search, first match with lowest ordinal matches
                index = LinearIndexOf(fieldName, CompareOptions.IgnoreCase);
                if (-1 == index)
                {
                    // do the slow search now (kana, width insensitive comparison)
                    index = LinearIndexOf(fieldName, ADP.DefaultCompareOptions);
                }
            }
            return index;
        }