Many arguments for the ToText function have been specified as optional. However, you can only leave an argument blank if all the arguments that follow it are left blank as well. In other words, you cannot leave the y and z arguments blank and provide an argument for w. It is possible, however, to leave one, two, or all of the optional arguments blank, as long as no arguments are supplied after the blank arguments.
The following combinations are possible when supplying arguments to the ToText function: