Converting values to string

Converting values to string

Hi! I'm having some trouble converting certain values in a form to string.  I'm trying to use these values to fill a multi-line text field, for example, TimeStamp, Number, Decimal Value, etc. and fill all of these into the multiline text area. I only get the string values. 
I'm trying toString() but I get a long number instead of the actual string.

My script (latest attempt not working correctly) would look something like this:

  1. input.multiline_field = input.TimeStampField.toString("dd/MM/yy HH:mm:ss") + " | " + input.NumberField.toString() + " | " + input.DecimalField.toString() + " | " + input.LookupField.toString ();