Use the SetDataLabelsRange(String,Nullable<CellReferenceMode>) method to assign a new value.
The cell values obtained from this property are only displayed when the DataLabel.ShowRange property is set to true.
The specified range must contain only one column or one row, or an exception is thrown.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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