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If your user control contains input controls, it s difficult to use caching. The problem occurs if the content in the input controls affects the cached content that the user control displays. With ordinary caching, you re stuck reusing the same copy of the user control, regardless of what the user types into an input control. (A similar problem exists with web pages, which is why it seldom makes sense to cache a web page that includes input controls.) The VaryByControl property solves this problem. VaryByControl takes a semicolon-delimited string of control names that are used to vary the cached content in the same way that VaryByParameter varies the cached content for query string values. For example, consider the following user control: <%@ Control Language="vb" AutoEventWireup="true" CodeFile="VaryByControl.ascx.vb" Inherits="VaryByControl" %> <asp:DropDownList id="lstMode" runat="server" Width="187px"> <asp:ListItem>Large</asp:ListItem> <asp:ListItem>Small</asp:ListItem> <asp:ListItem>Medium</asp:ListItem> </asp:DropDownList> <br /> <asp:button ID="Button1" text="Submit" OnClick="SubmitBtn_Click" runat=server/> <br /><br /> Control generated at:<br /> <asp:label id="TimeMsg" runat="server" /> When the button is clicked, it displays the current date in one of three formats: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Select Case lstMode.SelectedIndex Case 0 TimeMsg.Font.Size = FontUnit.Large Case 1 TimeMsg.Font.Size = FontUnit.Small

There s no easy way to jump to a location in a text or binary file without reading through all the information in order. While you can use methods such as Seek() on the underlying stream, you need to specify an offset in bytes. This involves some fairly involved calculations to determine variable sizes. If you need to store a large amount of information and move through it quickly, you need a dedicated database, not a binary file.

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Many user controls are designed to abstract away the details of common scenarios with a higherlevel control model. For example, if you need to enter address information, you might group several text box controls into one higher-level AddressInput control. When you re modeling this sort of control, you ll need to use more complex data than individual strings and numbers. Often, you ll want to create custom classes designed expressly for communication between your web page and your user control. To demonstrate this idea, the next example develops a LinkTable control that renders a set of hyperlinks in a formatted table. Figure 14-4 shows the LinkTable control.

Case 2 TimeMsg.Font.Size = FontUnit.Medium End Select TimeMsg.Text = DateTime.Now.ToString("F") End Sub It s not sufficient to keep one cached copy of this page, because the display format changes depending on the selection in the lstMode control (see Figure 14-9).

ASP NET includes two controls that allow website users to upload files to the web server Once the web server receives the posted file data, it s up to your application to examine it, ignore it, or save it to a back-end database or a file on the web server The controls that allow file uploading are HtmlInputFile (an HTML server control) and FileUpload (an ASPNET web control) Both represent the <input type="file"> HTML tag The only real difference is that the FileUpload control takes care of automatically setting the encoding of the form to multipart/form data If you use the HtmlInputFile control, it s up to you to make this change using the enctype attribute of the <form> tag if you don t, the HtmlInputFile control won t work Declaring the FileUpload control is easy.

Figure 14-4. A user control that displays a table of links To support this control, you need a custom class that defines the information needed for each link: public class LinkTableItem { private string text; public string Text { get { return text; } set { text = value; } } private string url; public string Url { get { return url; } set { url = value; } } // Default constructor. public LinkTableItem() {} public LinkTableItem(string text, string url) {

You can handle this using the VaryByControl attribute and referring specifically to this control: <%@ OutputCache Duration="30" VaryByControl="lstMode" %> When you try this example, you ll see a different date for each option, which emphasizes that ASP .NET maintains a separate cached copy for each list selection.

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