How to Use Parameters in Filters in .NET

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How to Use Parameters in Filters
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A filter can be added to a dataset, a data region, or a grouping level. In all cases, the process is very similar. A filter is most commonly based on a report parameter s value, which might be selected from a list that is created from another dataset in the report. It can also be based on any valid expression. Before defining a filter using a report parameter, you must first add the report parameter to the report. Then you add a filter definition to the applicable object, such as the report s main dataset, using the object s properties dialog box. It s good practice to display the report parameter s label in the report in case the user decides to save or print the report for future reference.
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Creating a Report Parameter for a Filter
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A filter is similar to a query parameter in that both result in fewer detail rows for the report. However, a query parameter filters data at the data source when the query is executed and returns a filtered row set to the dataset. A filter, by contrast, prevents some rows in the dataset from being displayed in a report, but it does not eliminate them from the dataset. Using a filter can improve report performance when the user changes report parameters, because data is available for rendering without necessitating another query to the database.
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Building Advanced Reports
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values were supplied for all the report parameters, the report was executed and rendered using those values. Notice that the report parameters are placed left to right, wrapping to the next row when space is limited, in the same order in which they appear in the Report Parameters dialog box.
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Note
A query parameter can also improve report performance by returning fewer rows in the dataset. Whether to use a query parameter or a filter parameter depends on the volume of rows that are being returned from the data source versus the volume of rows that are being filtered out of the dataset for rendering.
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As with query parameters, you should make sure that the report parameter value used in a filter is valid. The best way to do this is to use a query to build a list of available values for the report parameter. This query should contain columns only for labels and values. By using a query, you can keep the list of available values up to date with actual values contained in the source database. In this procedure, you will add a dataset to the report to retrieve valid values for a report parameter.
Add a dataset for report parameter values
Click the Data tab, and then click <New Dataset in the Dataset > list box. Type Category as the dataset name, and then click OK. Click the Generic Query Designer button to toggle from the Generic Query Designer to the Query Builder. Right-click in the Diagram pane (the top pane), and then click Add Table. Click DimProductCategory in the list of tables, click the Add button, and then click the Close button. The DimProductCategory table is displayed in the Diagram pane. You can build a SQL query by using the table diagram to select columns from the table. Select the ProductCategoryKey and ProductCategoryName check boxes in the DimProductCategory table diagram. The DimProductCategory table contains only five records that represent the distinct names of all product categories that Adventure Works sells, whereas the vProductProfitability view contains many records for sales transactions that also include category names. You get the same results whether you query the table or the view, but querying DimProductCategory to get values for a report parameter is potentially much faster because fewer records must be scanned. Enter AS CategoryKey after ProductCategoryKey in the SQL pane, and then enter AS Category after ProductCategoryName so that the SQL statement looks like this:
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