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Displaying Data using ASP.NET 2.0 CheckBoxList and C#
This tutorial will show you how to display data using the .NET CheckBoxList Control, ASP.NET 2.0 and C#.NET
The .NET Framework offers a number of classes that makes populating controls with data easy.
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We will need to first import the System.Data.SqlClient namespace. The System.Data.SqlClient namespace contains the methods we will need to query our SQL database.
| using System.Data.SqlClient; |
We'll put our code in the btnSubmit_Click() event.
When the btnSubmit_Click() event fires it queries our database and creates a new SqlDataReader by invoking the ExecuteReader() method of our cmd object. We make sure to specify the DataTextField property so the CheckBoxList control will know which columns to display as a list.
protected void Page_Load(object sender, EventArgs e)
{
try {
SqlCommand cmd = new SqlCommand("SELECT TOP 5 firstname,lastname,hiredate FROM EMPLOYEES", new SqlConnection("Server=localhost;Database=Northwind;Trusted_Connection=True;"));
cmd.Connection.Open();
SqlDataReader datareader = cmd.ExecuteReader();
chkBoxEx.DataSource = datareader;
chkBoxEx.DataTextField = "firstname";
chkBoxEx.DataBind();
cmd.Connection.Close();
cmd.Connection.Dispose(); } catch (Exception ex) {
lblStatus.Text = ex.Message; } |
The front end .aspx page looks something like this:
<table width="600" border="0" align="center" cellpadding="5" cellspacing="1" bgcolor="#cccccc">
<tr>
<td width="100" align="right" bgcolor="#eeeeee" class="header1" style="height: 62px"> Employee Data Populating A CheckBoxList Control:</td>
<td align="center" bgcolor="#FFFFFF" style="height: 62px">
<asp:CheckBoxList ID="chkBoxEx" runat="server">
</asp:CheckBoxList><asp:label ID="lblStatus" runat="server"></asp:label></td>
</tr>
</table> |
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The flow for the code behind page is as follows.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e) {
try {
SqlCommand cmd = new SqlCommand("SELECT TOP 5 firstname,lastname,hiredate FROM EMPLOYEES", new SqlConnection("Server=localhost;Database=Northwind;Trusted_Connection=True;"));
cmd.Connection.Open();
SqlDataReader datareader = cmd.ExecuteReader();
chkBoxEx.DataSource = datareader;
chkBoxEx.DataTextField = "firstname";
chkBoxEx.DataBind();
cmd.Connection.Close();
cmd.Connection.Dispose(); } catch (Exception ex) {
lblStatus.Text = ex.Message; } } |
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