Aggregate Function (ReportViewer)
Returns a custom aggregate of the specified expression, as defined by the data provider.
The expression on which to perform the aggregation. The expression must be a simple field reference.
(String) The name of a data table, object, grouping, or data region that contains the report items to which to apply the aggregate function. If Scope is specified, the aggregate function applies to all data in the data source, grouping, or data region. All group expressions for the specified scope must contain simple field references. For more information about the Scope parameter, see Built-in Functions for ReportViewer Reports.
The following code example provides a custom aggregation of line item totals in the Order grouping or data region.