📄 tracecategories.aspx

📁 asp.net技术内幕的书配源码

💻 ASPX

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<%@ Page Trace="True" TraceMode="SortByCategory" %>
<%@ Import Namespace="System.Data.SqlClient" %>

<Script Runat="Server">
Sub Page_Load
  Dim conPubs As SqlConnection
  Dim cmdSelect As SqlCommand

  conPubs = New SqlConnection( "Server=Localhost;UID=sa;PWD=secret;Database=Pubs" )
  cmdSelect = New SqlCommand( "SELECT au_lname FROM Authors", conPubs )
  Trace.Warn( "Database", "Opening Connection" )
  conPubs.Open()
    dropAuthors.DataSource = cmdSelect.ExecuteReader()
    dropAuthors.DataTextField = "au_lname"
    Trace.Warn( "Database", "Binding to DropDownList" )
    dropAuthors.DataBind
  Trace.Warn( "Database", "Closing Connection" )
  conPubs.Close()
End Sub

Sub Button_Click( s As Object, e As EventArgs )
  Trace.Warn( "Form", "User selected " & dropAuthors.SelectedItem.Text )
End Sub
</Script>

<html>
<head><title>TraceCategories.aspx</title></head>
<body>
<form Runat="Server">

<h2>Choose an Author</h2>

<b>Author Last Name:<b>
<asp:DropDownList
  ID="dropAuthors"
  Runat="Server" />
<asp:Button
  Text="Select!"
  OnClick="Button_Click"
  Runat="Server" />

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

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