toString()
Converts the current Numeric value to a String.
Syntax
String  toString()
Example
If you enter an expression for the text property of a Word Box or Word Wrap Box, the
                value must be a String. You can use the toString() function in your
                expressions to convert numbers to Strings. When you drag a Numeric data item onto
                the Report Design Window, it is automatically placed in a Word Box, and an
                expression for the text property is created to convert it to a String. 
For example:
order_line.unitprice.toString()