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In short, using custom .NET code gives developers the ability to extend the capabilities of SSRS 2008 far beyond those that are available out of the box. This chapter will cover the following: Custom code for use within your report using code embedded in the report: This method is the simplest way to add custom code to your report, and it deploys along with your report since it is contained in the RDL. However, it limits what you can do, must be written in VB .NET, and offers limited debugging support. Custom code for use within your report using a custom assembly called by the report: This method is more involved to implement and more difficult to deploy, but it offers you nearly unlimited flexibility. Your custom code has the full power of the .NET Framework at its disposal and has the added benefit that you can use the custom assembly across multiple reports. You can also use the full debugging capabilities of Visual Studio while developing your custom assembly.

The example was simple in terms of querying the products table. In fact, it was so simple that the information is not clear enough. If users do not have a complete categories and suppliers catalog, the category Id of 1 and supplier ID of 2 are meaningless. By changing the grid definition just a little bit, as shown in Listing 15-18, we have a different situation. Listing 15-18. Modifying the RadGrid to Show More Information, Thus Executing a Lot More Queries ASPX Page <telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false"> <MasterTableView DataKeyNames="ProductID" ShowFooter="true"> <Columns> <telerik:GridBoundColumn DataField="ProductID" HeaderText="ID" SortExpression="ProductID" UniqueName="ProductID"> </telerik:GridBoundColumn> <telerik:GridBoundColumn DataField="ProductName" HeaderText="Name" SortExpression="ProductName" UniqueName="ProductName"> </telerik:GridBoundColumn> <telerik:GridBoundColumn DataField="Category.CategoryName" HeaderText="Category" SortExpression="CategoryID" UniqueName="CategoryID"> </telerik:GridBoundColumn> <telerik:GridBoundColumn DataField="Supplier.CompanyName" HeaderText="Supplier" SortExpression="SupplierID" UniqueName="SupplierID"> </telerik:GridBoundColumn> </Columns> </MasterTableView> </telerik:RadGrid> Now, we are telling RadGrid to show the category name instead of the category ID and the supplier s company name instead of its ID. The result is shown in Figure 15-18.

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Figure 9-8. Default trace log file location You can read the trace files by running this query: SELECT * FROM fn_trace_gettable('c:\FilePath\FileName.trc', default) Alternatively, you can simply open the .trc files using SQL Server Profiler, as shown in Figure 9-9.

Generally, you will add custom code to your report when you need to perform complex functions and you need the capabilities of a full programming language to accomplish them. However, before you embark on writing custom .NET code, you should first evaluate whether using the built-in expression functionality can meet your needs. Using .NET embedded code or custom assemblies instead of native SSRS functions can give you serious performance degradation.

Figure 15-18. Improving the query to show meaningful information. Everything is going fine, until we realize that with lazy loading, we are not executing one query to the database we are executing 38 queries. The reason for that is that OpenAccess loads the products information just as before, but because we requested the category name instead of the ID, it must query the categories table. However, it doesn t know that from the beginning. Once OpenAccess realizes that it has only the category ID (from the products table), it then queries the categories table eight times more, one for each value of the CategoryID property. If you are counting, we have executed nine queries (one for the products and eight for the categories). Now, the same happens for the supplier, but there are 29 suppliers, all of which have been referenced in the products table through the SupplierID field; so in total, 38 queries are executed. The queries are as follows: --This query was executed once SELECT a.[ProductID] AS COL1, a.[CategoryID] AS COL2, a.[CategoryID] AS COL3, a.[Discontinued] AS COL4, a.[ProductName] AS COL5, a.[QuantityPerUnit] AS COL6, a.[ReorderLevel] AS COL7, a.[SupplierID] AS COL8, a.[SupplierID] AS COL9, a.[UnitPrice] AS COL10, a.[UnitsInStock] AS COL11, a.[UnitsOnOrder] AS COL12 [Products] a

Using embedded code is by far the easiest way to implement custom NET code in your reports, for two main reasons First, you simply add the code directly to the report using the Report Designer s user interface (UI) in either BIDS or Visual Studio Second, this code becomes a segment within the report s RDL file, making its deployment simple because it is a part of your report and will be deployed with it Although it is easier to use, embedded code does have a few considerations that you should take into account: Embedded code must be written in VB NET: If you are a C# programmer or use some other NET-compatible language as your primary development language, this may force you to use the custom assembly for all but the simplest of functions.

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