The DataSourceSelectArguments.TotalRowCount property supports paging scenarios. Data source and data source view controls differ in their internal implementation for how to retrieve total row counts. Check the DataSourceView.CanRetrieveTotalRowCount property to determine whether a data source view supports retrieving a total row count during a data-retrieval operation. If the data source supports it, the DataSourceSelectArguments.TotalRowCount property is set by the data source control during the course of a data-retrieval operation, and the total data row count is returned in the DataSourceSelectArguments.TotalRowCount property, much as a value is returned in an output parameter of a method.