The Web Report Designer is primarily designed to work with data-aware reports, dynamic) data source. bind a report to a data source.
After creating a new report, the Field List shows the structure of the report's data source. Fields from the Field List can be dropped onto the report to create data-aware controls of the appropriate type.
When a bound data source contains more than one data table, you can specify the data table from which your report obtains its data. To do this, specify the report's Data Member property.