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definition is, more or less, final. The only way to add new members, update members, or remove members is to recode and recompile the code base into an updated assembly (or take more drastic measures, such as using the System.Reflection.Emit namespace to dynamically reshape a compiled type in memory). In C#, it is now possible to define extension methods. In a nutshell, extension methods allow existing compiled types (specifically, classes, structures, or interface implementations) as well as types currently being compiled (such as types in a project that contains extension methods) to gain new functionality without needing to directly update the type being extended. This technique can be quite helpful when you need to inject new functionality into types for which you do not have an existing code base. It can also be handy when you need to force a type to support a set of members (in the interest of polymorphism), but cannot modify the original type declaration. Using extension methods, you can add functionality to precompiled types while providing the illusion these methods were there all along.

At this point, you can retrieve the child DataGrid control from the second column and bind it to the product information by programmatically calling the Select() method of the data source To ensure that you show only the products in the current category, you must also retrieve the CategoryID field for the current item and pass it as a parameter Here s the code you need: Protected Sub gridMaster_RowDataBound( ByVal sender As Object, ByVal e As GridViewRowEventArgs) ' Look for data items If eRowRowType = DataControlRowTypeDataRow Then ' Retrieve the GridView control in the second column Dim gridChild As GridView = CType(eRowCells(1)Controls(1), GridView) ' Set the CategoryID parameter so you get the products ' in the current category only Dim catID As String = gridMasterDataKeys(eRowDataItemIndex)ValueToString() sourceProductsSelectParameters(0)DefaultValue = catID ' Get the data object from the data source.

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Note Understand that extension methods do not literally change the compiled code base! This technique only adds members to a type within the context of the current application.

Dim data As Object = sourceProductsSelect(DataSourceSelectArgumentsEmpty) ' Bind the grid gridChildDataSource = data gridChildDataBind() End If End Sub Figure 10-21 shows the resulting grid..

This file is not used by our chat example, but I decided to keep also the remoting services configuration file to show you how to configure multiple services in a BlazeDS application. Figure 9-28 shows the configuration files in the flex folder.

When you define extension methods, the first restriction is that they must be defined within a static class (see 5), and therefore each extension method must be declared with the static keyword. The second point is that all extension methods are marked as such by using the this keyword as a modifier on the first (and only the first) parameter of the method in question. The third point is that every extension method can be called either from the correct instance in memory or statically via the defining static class! Sound strange Let s look at a full example to clarify matters.

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