RowNumber Function (ReportViewer)
Returns a running count of all rows in the specified scope.
(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 a data table or object is specified, the running value is not reset throughout the entire dataset. If a grouping is specified, the running value is reset when the group expression changes. If a data region is specified, the running value is reset for each new instance of the data region. For more information about the Scope parameter, see Built-in Functions for ReportViewer Reports.
The following code example provides a running count of rows in the outermost data region.