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How to use CheckBoxList Control in ASP.NET

The CheckBoxList Control

you can use a CheckBoxList control to display a number of check boxes at once as a column of check boxes. The CheckBoxList control exists within the System.Web.UI.WebControls namespace. This control is often useful when you want to bind the data from a datasource to checkboxes . The CheckBoxList control creates multiselection checkbox groups at runtime by binding these controls to a data source.

Use of CheckBoxList Control

  • Where you find multiple options.
  •  In Shoping Site where you find sub category under category 
How to use CheckBoxList Control in ASP.NET

Example of CheckBoxList Control in ASP.NET 

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">
protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
        string s = "Your selected books are<br/>";
        foreach (ListItem s1 in CheckBoxList1.Items)
            if (s1.Selected)
                s = s + s1.Text + "<br/>";

        result.Text = s;


    protected void Page_Load(object sender, EventArgs e)

<html xmlns="">
<head runat="server">
    <form id="form1" runat="server">
        <div >
Select Your Favorite books:<br />
            <asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True">
                <asp:ListItem>ASP.NET </asp:ListItem>
                <asp:ListItem>WINDOWS FORMS</asp:ListItem>
                <asp:ListItem>JAVA SCRIPT</asp:ListItem>

        <asp:Label ID="result" runat="server"></asp:Label>

How to use CheckBoxList Control in ASP.NET

This example shows that you can choose multiple item in given list. Here foreach loop is running from starting index to ending imdex. When you select ASP.NET book item in the given list then your item will appear on the Label control under the CheckBoxList. If you again select Windows Forms Book in given list , PostBack will occurs and your result will appear on Label Control with previous result.   


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Binary Search Linear Search Works only on sorted items. such as  1,2,3,4,5,6  etc
Works on sorted as well as unsorted items. 12,4,5,3,2,1 etc Very efficient if the items are sorted Very efficient if the items are less and present in the beginning of the list. such as Suppose your list items are : 12,3,4,5,1 and you want to search 12 number then you get beginning in the list. Works well with arrays and not on linked lists. Works with arrays and linked lists.
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Memory representation of Linked List Data Structures in C Language

Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:

      Suppose next node is allocated at an address 506, so the list becomes,

  Suppose next node is allocated with an address with an address 10,s the list become,

The other way to represent the linked list is as shown below:

 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …