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Visual Studio saves you from the trouble of using the sn command-line tool. Instead, it allows you to generate and attach a key file without leaving the development environment. To do so, double-click the Properties section in the Solution Explorer, and select the Signing tab. Select the check box Sign the assembly and then choose your key file in the drop-down list control. At this point, you can generate a new key (by selecting New) or browse to the location of an existing key file (by choosing Browse). Once you complete this step, the assembly key file will be added to the project and it will appear in the Solution Explorer. Note that you don t need to add the AssemblyKeyFile attribute to your application when you use this approach. Instead, Visual Studio will take care of emitting the appropriate metadata when it compiles the assembly.

Change the InitialLOBCacheSize property if you know in advance the size of the LOB objects you are frequently fetching from the database.

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Now that your control assembly is signed, you can install it to the GAC using a dedicated setup program or the Global Assembly Cache tool (gacutil.exe) included with the .NET framework, as shown here: gacutil /i CustomControl.dll You can also drag and drop the assembly to the C:\[WindowsDir]\Assembly directory in Windows Explorer, which installs it automatically using a special plug-in. You ll see your assembly listed in the assembly list (see Figure 9-8), with its public key and version information. Life couldn t be easier. If you install later versions of the same assembly in the GAC, the original version remains alongside the new version. Clients automatically use the assembly that they were compiled with (and raise an exception if they can t find the right version in the GAC). You can uninstall assemblies using the /u switch in the Global Assembly Cache tool, or by selecting the assembly in Windows Explorer and pressing the Del key.

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Tip There are many more options for configuring version policies using application configuration files. You

After you ve established a cursor to your data source, data retrieval can also be a performance-intensive affair. The objective of performance optimization in this area would be to cut down on as much roundtrips to the server as possible to retrieve the data you need. This can be done via two methods: Changing the FetchSize property Enabling the client result cache

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This chapter introduced one of the most important ingredients in advanced user interfaces custom controls. Now that you ve digested the basics of creating, compiling, and consuming a custom control, it s time to look at some practical examples in the next three chapters. All of these custom controls are included with the downloadable code samples for this book

The FetchSize property, as its name indicates, represents the size of the data to fetch during each roundtrip made to the server. It directly affects the performance of the OracleDataReader object. The FetchSize property is set to 64KB by default. You can change this value if you would like to retrieve more data than this amount during each round-trip to the server. The OracleCommand property also provides a RowSize property, which can come in pretty handy when you need to set the FetchSize. Rather than simply guessing a number to use for FetchSize, you can specify the amount to fetch in terms of number of rows instead. This can be done using this rather simple formula:

Note All the control projects in the samples have names that end with Control (as in DirectoryTreeControl), while the Windows Forms projects that test the controls have names that end with Host (as in DirectoryTreeHost). The easiest way to run these examples is to open the solution file that will open both projects at once.

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