This property allows you to determine if the the field supports
Most fields have a single value. A text box contains one item of
text. A radio button group has one selected button. A checkbox can
be checked or clear.
However some kinds of fields can hold multiple values. For
example a list box can be used to select multiple items. If this is
the case then the MultiSelect property will be set to true.
If the field supports multiple selection then the Value of the field will be a comma delimited list
of the items which are selected.