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If you use simple property types such as int, DateTime, float, and so on, you can still set them with string values when declaring the control on the host page. ASP.NET will automatically convert the string to the property type defined in the class. Technically, ASP.NET employs a type converter a special type of object often used to convert data types to and from string representations, which is described in 28.

You can also use the ReadToEnd() method to read the entire content of the file and return it as a single string. The File class also includes some shortcuts with static methods such as ReadAllText() and ReadAllBytes(), which are suitable for small files only.

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Now in the hosting page you ll see that the displayed time won t change for ten seconds. Refreshing the page has no effect. The VaryByParam parameter has the same meaning as it did with web pages it allows to you to generate and cache fresh HTML output when the parameters in the query string portion of the URL change. Alternatively, you can enable caching by adding the following attribute to the declaration of your user control class: <PartialCaching(10)> _ Public Class MyUserControl Inherits UserControl ... End Class There s one caveat when using fragment caching. When a user control is cached, the user control essentially becomes a block of static HTML. As a result, the user control object won t be available to your web-page code. Instead, ASP .NET instantiates one of two more generic object types, depending on how the user control was created. If the user control was created declaratively (by adding a user tag to the web page), a StaticPartialCachingControl object is added. If the user control was created programmatically (using the LoadControl() method), a PartialCachingControl object is added. ASP .NET places the object into the logical position that a user control would occupy in the page s control hierarchy if it were not cached. However, these objects are just placeholders they won t allow you to interact with the user control through its properties or methods. If you aren t sure if caching is in effect, you should test for a null reference before you attempt to use the user control object.

You can also write to a binary file. Binary data uses space more efficiently but also creates files that aren t readable. If you open a binary file in Notepad, you ll see a lot of extended characters (politely known as gibberish). To open a file for binary writing, you need to create a new BinaryWriter class. The class constructor accepts a stream, which you can create by hand or retrieve using the File.OpenWrite() method. Here s the code to open the file c:\binaryfile.bin for binary writing: BinaryWriter w = new BinaryWriter(File.OpenWrite(@"c:\binaryfile.bin")); .NET concentrates on stream objects, rather than the source or destination for the data. This means you can write binary data to any type of stream, whether it represents a file or some other type of storage location, using the same code. In addition, writing to a binary file is almost the same as writing to a text file, as you can see here: string str = "ASP.NET Binary File Test"; int integer = 1000; w.Write(str); w.Write(integer); w.Flush(); w.Close(); Unfortunately, when you read data, you need to know the data type you want to retrieve. To retrieve a string, you use the ReadString() method. To retrieve an integer, you must use ReadInt32(), as follows: BinaryReader r = new BinaryReader(File.OpenRead(@"c:\binaryfile.bin")); string str; int integer; str = r.ReadString(); integer = r.ReadInt32();

When you begin adding properties to a user control, it becomes more important to understand the sequence of events. Essentially, page initialization follows this order: 1. The page is requested. 2. The user control is created. If you have any default values for your variables, or if you perform any initialization in a class constructor, it s applied now. 3. If any properties are set in the user control tag, these are applied now. 4. The Page.Load event in the page executes, potentially initializing the user control. 5. The Page.Load event in the user control executes, potentially initializing the user control. Once you understand this sequence, you ll realize that you shouldn t perform user control initialization in the Page.Load event of the user control that might overwrite the settings specified by the client.

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