Gets or sets value or expression that evaluates to the value to hand in for
the parameter to the subreport or control.
For Drillthrough in Chart, this is the name of a
DataField from which to obtain the value rather than an expression.
Namespace:
C1.C1Rdl.Rdl2008Assembly: C1.C1Report.2 (in C1.C1Report.2.dll)