📄 datareader-binding.aspx
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<%@Page Language="C#" %>
<%@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="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
// get connection string from ..\global\connect-strings.ascx user control
string strConnect = ctlConnectStrings.OLEDBConnectionString;
// create a SQL statement to select some rows from the database
string strSelect = "SELECT * FROM BookList WHERE ISBN LIKE '%1861003%'";
// create a variable to hold an instance of a DataReader object
OleDbDataReader objDataReader;
try
{
// create a new Connection object using the connection string
OleDbConnection objConnect = new OleDbConnection(strConnect);
// open the connection to the database
objConnect.Open();
// create a new Command using the connection object and select statement
OleDbCommand objCommand = new OleDbCommand(strSelect, objConnect);
// execute the SQL statement against the command to get the DataReader
objDataReader = objCommand.ExecuteReader();
}
catch (Exception objError)
{
// display error details
outError.InnerHtml = "<b>* Error while accessing data</b>.<br />"
+ objError.Message + "<br />" + objError.Source + "<p />";
return; // and stop execution
}
// 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
}
</script>
<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>
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