CountDistinct Function (Visual Studio Report Designer)
Returns a count of all distinct values of the specified expression.
(Variant) The expression on which to perform the aggregation. The expression cannot contain aggregate functions.
(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. For more information about the Scope parameter, see Built-in Functions for Reports (Visual Studio Report Designer).
Returns an Integer.
The following code example provides a count of managers in the Department grouping or data region.
Using Expressions in a Report (Visual Studio Report Designer)
Adding Custom Code to a Report (Visual Studio Report Designer)
ReportViewer Controls (Visual Studio)
Built-in Functions for Reports (Visual Studio Report Designer)