Gets or sets expression to evaluate globally for the report or for each group instance. Unlike expressions evaluated in visual elements of the report, each instance of this expression is calculated only once when the report is executed and never recalculated during subsequent renderings. This is necessary for time-dependent calculations.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2