| 代码说明：如要把ASP.NET的默认编程语言从Visual Basic修改为C#,就可以使用：
<%@ Page Language="C#" %>
要允许对页面实行跟踪，就可以使用
<%@ Page Trace="True" %>
使用Trace类的Write()和Warn()方法显示跟踪信息。后者显示红色文本。
要在页面上显示运行时的错误信息，需要使用Debug处理指令
<%@ Page Debug="True" %>
<Script Runat="Server">
Sub Page_Load
Dim RanNum As New Random
lblFirstRanNum.Text = RanNum.Next( 1, 11 )
If Not Page.IsPostBack Then
lblSecondRanNum.Text = RanNum.Next( 1, 11 )
End If
End Sub
</Script>
<html>
<head><title>IsPostBack.aspx</title></head>
<body>
<form Runat="Server">
The first random number is:
<asp:label id="lblFirstRanNum" Runat="Server"/>
<p>
The second random number is:
<asp:label id="lblSecondRanNum" Runat="Server"/>
<p>
<asp:button Text="Click Here!" Runat="Server"/>
</form>
</body>
</html>
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