>>

>>foreach (KeyValuePair<String, String> kvp in rowValues)
>>         {
>>            String passedValue = kvp.Value.Trim();          //  I would not Trim() here.  Make sure the are Trimmed before they go in the dictionary
>>            string rowValue = bookingRow[kvp.Key].ToString().Trim();
>
>>            if ( passedValue != rowValue ) 
>>            {
>>   >                  this.SaveToBookingHistory(booking_id, "M", kvp.Key, rowValue , passedValue, ref messageText, ref statusCode);
>>            }
>>         }

I think they actually trimmed in the method that populates dictionary, I'll double check.

That was my original attempt but it doesn't work as rowValue will be 0 (in case of numeric) and my string value will be empty. This is why I started the whole business of attempting to convert to the proper type.