📄 datareader-binding.aspx
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<%@Page Language="VB"%>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.OleDb" %>
<%@ Register TagPrefix="wrox" TagName="connect" Src="..\global\connect-strings.ascx" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head>
<title>Repeated-Value Data Binding to a DataReader Object</title>
<style type="text/css">
body, td {font-family:Tahoma,Arial,sans-serif; font-size:10pt}
input {font-family:Tahoma,Arial,sans-serif; font-size:9pt}
.heading {font-family:Tahoma,Arial,sans-serif; font-size:14pt; font-weight:bold}
.subhead {font-family:Tahoma,Arial,sans-serif; font-size:12pt; font-weight:bold; padding-bottom:5px}
.cite {font-family:Tahoma,Arial,sans-serif; font-size:8pt}
</style></head>
<body bgcolor="#ffffff">
<span class="heading">Repeated-Value Data Binding to a DataReader Object</span><hr />
<!--------------------------------------------------------------------------->
<%'-- insert connection string script --%>
<wrox:connect id="ctlConnectStrings" runat="server"/>
<div id="outError" runat="server" />
<!-- Unlike the DataView we can only bind a object DataReader to one control -->
<!-- after it has bound the data the reader is at the end of the source rowset -->
<b><ASP:DataGrid></b> control:<br />
<ASP:DataGrid id="MyDataGrid" runat="server" /><p />
<!--------------------------------------------------------------------------->
<script language="vb" runat="server">
Sub Page_Load()
'get connection string from ..\global\connect-strings.ascx user control
Dim strConnect As String = ctlConnectStrings.OLEDBConnectionString
'create a SQL statement to select some rows from the database
Dim strSelect As String
strSelect = "SELECT * FROM BookList WHERE ISBN LIKE '1861003%'"
'create a variable to hold an instance of a DataReader object
Dim objDataReader As OleDbDataReader
Try
'create a new Connection object using the connection string
Dim objConnect As New OleDbConnection(strConnect)
'open the connection to the database
objConnect.Open()
'create a new Command using the connection object and select statement
Dim objCommand As New OleDbCommand(strSelect, objConnect)
'execute the SQL statement against the command to get the DataReader
objDataReader = objCommand.ExecuteReader()
Catch objError As Exception
'display error details
outError.InnerHtml = "<b>* Error while accessing data</b>.<br />" _
& objError.Message & "<br />" & objError.Source & "<p />"
Exit Sub ' and stop execution
End Try
'set the DataSource property of the control
'a DataGrid can figure out the columns in the DataReader
'by itself, so we just set the DataSource property
MyDataGrid.DataSource = objDataReader
MyDataGrid.DataBind() 'and bind the control
End Sub
</script>
<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>
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