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By default, the maximum size of the uploaded file is 4 MB. If you try to upload a bigger file, you ll get a runtime error. To change this restriction, modify the maxRequestLength attribute of the <httpRuntime> setting in the application s web.config file. The size is specified in kilobytes, so <httpRuntime maxRequestLength="8192"/> sets the maximum file size to 8 MB.

A data provider is a set of ADO.NET classes that allows you to access a specific database, execute SQL commands, and retrieve data. Essentially, a data provider is a bridge between your application and a data source. The classes that make up a data provider include the following: Connection: You use this object to establish a connection to a data source. Command: You use this object to execute SQL commands and stored procedures. DataReader: This object provides fast read-only, forward-only access to the data retrieved from a query. DataAdapter: This object performs two tasks. First, you can use it to fill a DataSet (a disconnected collection of tables and relationships) with information extracted from a data source. Second, you can use it to apply changes to a data source, according to the modifications you ve made in a DataSet.

Open(), OpenRead(), OpenRead(), and OpenText() ReadAllText(), ReadLines(), and ReadBytes()

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Although it s fairly easy to create a unique filename, what happens in the situation where you really do need to access the same file to serve multiple different requests Although this situation isn t ideal (and often indicates that a database-based solution would work better), you can use certain techniques to defend yourself.

ADO.NET doesn t include generic data provider objects. Instead, it includes different data providers specifically designed for different types of data sources. Each data provider has a specific implementation of the Connection, Command, DataReader, and DataAdapter classes that s optimized for a specific RBDMS (relational database management system). For example, if you need to create a connection to a SQL Server database, you ll use a connection class named SqlConnection.

WriteAllText(), WriteLines(), and WriteBytes() GetAccessControl()

One approach is to open your files with sharing, which allows multiple processes to access the same file at the same time. To use this technique, you need to use the four-parameter FileStream constructor that allows you to select a FileMode. Here s an example: Dim fs As New FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read) This statement allows multiple users to open the file for reading at the same time. However, no one will be able to update the file.

<hr> <%# GetVersionInfoString(DataBinder.Eval(Container.DataItem, "FullName")) %> </ItemTemplate> </asp:DataList> The data binding expressions are fairly straightforward. The only one that needs any expression is the GetVersionInfoString() method. This method is coded inside the page class. It creates a new FileVersionInfo object for the file and uses that to extract the version information and product name. protected string GetVersionInfoString(object path) { FileVersionInfo info = FileVersionInfo.GetVersionInfo((string)path); return info.FileName + " " + info.FileVersion + "<br>" + info.ProductName + " " + info.ProductVersion; } Of course, most developers have FTP tools and other utilities that make it easier to manage files on a web server. However, this page provides an excellent example of how to use the .NET file and directory management classes. With a little more work, you could transform it into a fullfeatured administrative tool for a web application.

The only feature that the File class lacks (and the FileInfo class provides) is the ability to retrieve the size of a specified file.

Another technique that works well if multiple users need to access the same data, especially if this data is frequently used and not excessively large, is to load the data into the cache (as described in 11). That way, multiple users can simultaneously access the data without a hitch. Of course, this approach may not suit your needs if another process is responsible for creating or periodically updating the file, in which case you can t be sure the data you ve cached is up-to-date.

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