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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.

The design-time support for user controls is greatly improved in ASP.NET 2.0. Now you can see a real representation of the user control at design time (rather than a blank gray box), and you can use the smart tag to quickly jump to the corresponding .ascx file. Best of all, when you add the user control to a web page, Visual Studio makes the corresponding user control object available to your code automatically, as you ll see in later examples.

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For example, you might want to show the target link in a server-side <iframe> or use it to set the content for an <img> tag rather than navigating to a new page Next, you need to create a new delegate that represents the LinkClicked event signature Here s what it should look like: Public Delegate Sub LinkClickedEventHandler(ByVal sender As Object, ByVal e As LinkTableEventArgs) Using the LinkClickedEventHandler, the LinkTable class defines a single event: Public Event LinkClicked As LinkClickedEventHandler public event LinkClicked as LinkClickedEventHandler To intercept the server click, you need to replace the HyperLink control with a LinkButton, because only the LinkButton raises a server-side event (The HyperLink simply renders as an anchor that directs the user straight to the target when clicked) Here s the new template you need:.

Whenever you open a file through a FileStream, remember to call the FileStream.Close() method when Tip you re finished. This releases the handle on the file and makes it possible for someone else to access the file. In addition, because the FileStream class is disposable, you can use it with the using statement, which ensures that the FileStream is closed as soon as the block ends.

This book uses generic names for provider-specific objects. In other words, instead of discussing the SqlConnection and OracleConnection objects, you ll learn about all connection objects. Just keep in mind that there really isn t a generic Connection object it s just convenient shorthand for referring to all the provider-specific connection objects, which work in a standardized fashion.

<ItemTemplate> <img height="23" src="exclaimgif" width="25" align="absMiddle" border="0"> <asp:LinkButton id="HyperLink1" Font-Names="Verdana" Font-Size="XX-Small" ForeColor="#0000cd" runat="server" Text='<%# DataBinderEval(ContainerDataItem, "Text") %>' CommandArgument='<%# DataBinderEval(ContainerDataItem, "Url") %>'> </asp:LinkButton> </ItemTemplate> You can then intercept the server-side click event and forward it along to the web page as a LinkClicked event Here s the code you need: Protected Sub listContent_ItemCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs) If LinkClicked IsNot Nothing Then ' Get the HyperLink object that was clicked Dim link As LinkButton = CType(eItemControls(1), LinkButton) ' Construct the event arguments Dim item As New LinkTableItem(linkText, linkCommandArgument) Dim args As New LinkTableEventArgs(item) ' Fire the event LinkClicked(Me, args) ' Navigate to the link if the event recipient didn't ' cancel the operation If (Not argsCancel) Then ResponseRedirect(item.

You can write to a file and read from a file using the StreamWriter and StreamReader classes in the System.IO namespace. When creating these classes, you simply pass the underlying stream as a constructor argument. For example, here s the code you need to create a StreamWriter using an existing FileStream: FileStream fileStream = new FileStream(@"c:\myfile.txt", FileMode.Create); StreamWriter w = new StreamWriter(fileStream); You can also use one of the static methods included in the File and FileInfo classes, such as CreateText() or OpenText(). Here s an example that uses this technique to get a StreamWriter: StreamWriter w = File.CreateText(@"c:\myfile.txt"); This code is equivalent to the earlier example.

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