ASP.Net Checkbox

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ASP.NET Web Forms CheckBox

It is used to get multiple inputs from the user. It allows user to select choices from the set of choices.

It takes user input in yes or no format. It is useful when we want multiple choices from the user.

To create CheckBox we can drag it from the toolbox in visual studio.

This is a server side control and ASP.NET provides own tag to create it. The example is given below.

< asp:CheckBox ID="CheckBox2" runat="server" Text="J2EE"/>

Server renders it as the HTML control and produces the following code to the browser.

< input id="CheckBox2" type="checkbox" name="CheckBox2" /><label for="CheckBox2">J2EE</label>

This control has its own properties that are tabled below.

Property	Description
AccessKey	It is used to set keyboard shortcut for the control.
TabIndex	The tab order of the control.
BackColor	It is used to set background color of the control.
BorderColor	It is used to set border color of the control.
BorderWidth	It is used to set width of border of the control.
Font	It is used to set font for the control text.
ForeColor	It is used to set color of the control text.
Text	It is used to set text to be shown for the control.
ToolTip	It displays the text when mouse is over the control.
Visible	To set visibility of control on the form.
Height	It is used to set height of the control.
Width	It is used to set width of the control.
Checked	It is used to set check state of the control either true or false.

Example

// WebControls.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebControls.aspx.cs" 
Inherits="WebFormsControlls.WebControls" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <h2>Select Courses</h2>
            <asp:CheckBox ID="CheckBox1" runat="server" Text="J2SE" />
            <asp:CheckBox ID="CheckBox2" runat="server" Text="J2EE" />
            <asp:CheckBox ID="CheckBox3" runat="server" Text="Spring" />
        </div>
        <p>
            <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
        </p>
    </form>
    <p>
        Courses Selected: <asp:Label runat="server" ID="ShowCourses"></asp:Label>
    </p>
</body>
</html>

Code Behind

// WebControls.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebFormsControlls
{
    public partial class WebControls : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ShowCourses.Text = "None";
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            var message = "" ;
            if (CheckBox1.Checked)
            {
                message = CheckBox1.Text+" ";
            }
            if (CheckBox2.Checked)
            {
                message += CheckBox2.Text + " ";
            }
            if (CheckBox3.Checked)
            {
                message += CheckBox3.Text;
            }
            ShowCourses.Text = message;
        }
    }
}

Initially, there is no course selected then it shows none. It displays user selection as shown in the following screenshot.

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