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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>
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