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Figure 13-2. Examining a file Here s the code that binds the file information when a file is selected: protected void gridFileList_SelectedIndexChanged(object sender, System.EventArgs e) { // Get the selected file. string file = (string)gridFileList.DataKeys[gridFileList.SelectedIndex].Value; // The FormView shows a collection (or list) of items. // To accommodate this model, you must add the file object // to a collection of some sort. ArrayList files = new ArrayList(); files.Add(new FileInfo(file)); // Now show the selected file. formFileDetails.DataSource = files; formFileDetails.DataBind(); } The FormView uses the following template: <asp:FormView id="formFileDetails" runat="server"> <ItemTemplate> <b>File: <%# DataBinder.Eval(Container.DataItem, "FullName") %></b><br> Created at <%# DataBinder.Eval(Container.DataItem, "CreationTime") %><br> Last updated at <%# DataBinder.Eval(Container.DataItem, "LastWriteTime") %><br> Last accessed at <%# DataBinder.Eval(Container.DataItem, "LastAccessTime") %><br> <i><%# DataBinder.Eval(Container.DataItem, "Attributes") %></i><br> <%# DataBinder.Eval(Container.DataItem, "Length") %> bytes.

Uploader.PostedFile.SaveAs(destPath) lblStatus.Text = "Thanks for submitting your file" End If Catch err As Exception lblStatus.Text = err.Message End Try End If End Sub In the example, if a file has been posted to the server and isn t too large, the file is saved using the HttpPostedFile.SaveAs() method. To determine the physical path you want to use, the code combines the destination directory (Upload) with the name of the posted file using the Shared utility methods of the Path class. Figure 13-3 shows the page after the file has been uploaded.

You can use this object to examine the Windows ACLs that are applied on this directory and even change them programmatically..

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mapping, and the XmlAdapter class for more powerful DataSet-to-XML conversions, to name just a few). These may turn up again in separate toolkits or later versions of .NET, but for now developers are out of luck. So, what does that leave us with Here are some genuinely interesting ADO.NET changes that are still around: Provider factories: The dream of generic data access code (code you can write once and use with multiple different databases) takes a giant leap forward in .NET 2.0 thanks to provider factories new components that can create strongly typed Connection, Command, and DataAdapter objects on the fly. You ll learn about them in this chapter. Change notification: To build truly scalable web applications, you need to cache data that s retrieved from a database so it can be reused without connecting to the data source each time. However, caching introduces the possibility of out-of-date information. ADO.NET includes a new change notification feature that you can use to automatically remove cached data when the related records in the database change. You ll learn about this feature in 11. Connection statistics: It s a small frill, but the new connection-tracking features of the SqlConnection object might help you profile different data access strategies. They re introduced in this chapter. SQL Server 2005: SQL Server 2005 introduces a whole set of new features, and ADO.NET 2.0 supports them seamlessly. These features include user-defined data types that are based on .NET classes, as well as stored procedures written with .NET languages. For more information about these features, refer to a dedicated SQL Server 2005 book such as A First Look at Microsoft SQL Server 2005 for Developers (Addison-Wesley, 2004) or Pro SQL Server 2005 Assemblies (Apress, 2005).

Delete() Exists() GetAttributes() and SetAttributes() GetCreationTime(), GetLastAccessTime(), and GetLastWriteTime() Move()

You can also interact with the posted data through the stream model, rather than just saving it to disk. To get access to the data, you use the FileUpload.PostedFile.InputStream property. For example, you could use the following code to display the content of a posted file (assuming it s text-based): ' Display the whole file content. Dim r As New StreamReader(Uploader.PostedFile.InputStream) lblStatus.Text = r.ReadToEnd() r.Close()

ADO.NET uses a multilayered architecture that revolves around a few key concepts, such as Connection, Command, and DataSet objects. However, the ADO.NET architecture is quite a bit different from classic ADO. One of the key differences between ADO and ADO.NET is how they deal with the challenge of different data sources. In ADO, programmers always use a generic set of objects, no matter what the underlying data source is. For example, if you want to retrieve a record from an Oracle database, you use the same Connection class you would use to tackle the same task with SQL Server. This isn t the case in ADO.NET, which uses a data provider model.

Create() and CreateText()

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