Registering User Controls in the Web Configuration File : Basics « Custom Controls « ASP.NET Tutorial






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  3. Basics
File: Control.ascx

<%@ Control Language="C#" ClassName="RandomImage" %>
<%@ Import Namespace="System.IO" %>

<script runat="server">

    void Page_Load()
    {
        string imageToDisplay = GetRandomImage();
        imgRandom.ImageUrl = Path.Combine("~/Images", imageToDisplay);
        lblRandom.Text = imageToDisplay;
    }

    private string GetRandomImage()
    {
        Random rnd = new Random();
        string[] images = Directory.GetFiles(MapPath("~/Images"), "*.jpg");
        string imageToDisplay = images[rnd.Next(images.Length)];
        return Path.GetFileName(imageToDisplay);
    }

</script>

<asp:Image
    id="imgRandom"
    Width="300px"
    Runat="server" />
<br />
<asp:Label
    id="lblRandom"
    Runat="server" />
    
File: Web.Config

<configuration>
<system.web>
  <pages>
    <controls>
      <add
        tagPrefix="user"
        tagName="RandomImage"
        src="~/UserControls/Control.ascx"/>
    </controls>
  </pages>
</system.web>
</configuration>


After you register a User control in the web configuration file, you can declare the User control in any page. 

File: Default.aspx

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Application Register</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <user:RandomImage
        ID="RandomImage1"
        Runat="Server" />

    </div>
    </form>
</body>
</html>








14.2.Basics
14.2.1.User control with property
14.2.2.ASP controls in user control
14.2.3.A Web user control file template
14.2.4.Adding controls to the Web user control
14.2.5.Creating control events in a user control (C#)
14.2.6.Creating control events in a user control (VB)
14.2.7.Exposing user control properties (C#)
14.2.8.Exposing user control properties (VB)
14.2.9.Populating user control properties from the host Web page (C#)
14.2.10.Populating user control properties from the host Web page (VB)
14.2.11.Component level variable
14.2.12.Action from user-defined control
14.2.13.Pass parameter from user-defined controls to host page
14.2.14.Calculator component based on page component (VB.net)
14.2.15.Day minder page component
14.2.16.Use custom control in Assembly
14.2.17.Building a simple User control that randomly displays one image
14.2.18.Registering User Controls in the Web Configuration File
14.2.19.Building Fully Rendered Controls