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InProc is the default option, and it makes sense for most small websites In a web farm scenario, though, it won t work at all To allow session state to be shared between servers, you must use the out-of-process or SQL Server state service Another reason you might want to avoid InProc mode is because it makes for more fragile sessions In ASPNET, application domains are recycled in response to a variety of actions, including configuration changes, updated pages, and when certain thresholds are met (regardless of whether an error has occurred) If you find that your application domain is being restarted frequently and contributing to prematurely lost sessions, you can try to counter the effect by changing some of the process model settings (see 18), or you can change to one of the more robust session state providers.

Specifies that the operating system should open an existing file. Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. Specifies that the operating system should open an existing file. Once opened, the file will be truncated so that its size is 0 bytes.

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A GUID is a 128-bit integer. GUID values are tremendously useful in programming because they re statistically unique. In other words, you can create GUID values continuously with little chance of ever creating a duplicate. For that reason, GUIDs are commonly used to uniquely identify queued tasks, user sessions, and other dynamic information. They also have the advantage over sequential numbers in that they can t easily be guessed. The only disadvantage is that GUIDs are long and almost impossible to remember (for an ordinary human being). GUIDs are commonly represented in strings as a series of lowercase hexadecimal digits, like 382c74c3-721d-4f34-80e557657b6cbc27.

Before you use either the out-of-process or the SQL Server state service, keep in mind that more considerations will apply: When using the StateServer or SqlServer mode, the objects you store in session state must be serializable Otherwise, ASPNET will not be able to transmit the object to the state service or store it in the database If you re hosting ASPNET on a web farm, you ll also need to take some extra configuration steps to make sure all the web servers are in sync Otherwise, one might encode information in session state differently than another, which will cause a problem if the user is routed from one server to another during a session The solution is to modify the <machineKey> section of the machineconfig file so it s consistent across all servers For more information, refer to 5.

And here s how you can open a FileStream and read its contents into a byte array: FileStream fileStream = null; try { fileStream = new FileStream(fileName, FileMode.Open); byte[] dataArray = new byte[fileStream.Length]; for(int i = 0; i < fileStream.Length; i++) { dataArray[i] = fileStream.ReadByte(); } } finally { if (fileStream != null) fileStream.Close(); } On their own, streams aren t that useful. That s because they work entirely in terms of single bytes and byte arrays. .NET includes a more useful higher-level model of writer and reader objects that fill the gaps. These objects wrap stream objects and allow you to write more complex data, including common data types such as integers, strings, and dates. You ll see readers and writers at work in the following sections.

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