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ASP.NET CheckBoxList and ListBox real time example - Part 26

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Part 23 - Asp.net checkboxlist control
Part 24 - Asp.net checkboxlist, select or deselect all list items
Part 25 - ASP.NET ListBox control

In this video we will discuss about a simple real time example using asp.net checkboxlist and listbox.



Copy and Paste the following HTML on the ASPX page
<asp:CheckBoxList ID="CheckBoxList1" runat="server" 
    RepeatDirection="Horizontal" AutoPostBack="True" 
    onselectedindexchanged="CheckBoxList1_SelectedIndexChanged">
    <asp:ListItem Text="Diploma" Value="1"></asp:ListItem>
    <asp:ListItem Text="Graduate" Value="2"></asp:ListItem>
    <asp:ListItem Text="Post Graduate" Value="3"></asp:ListItem>
    <asp:ListItem Text="Doctrate" Value="4"></asp:ListItem>
</asp:CheckBoxList>
<br />
<asp:ListBox ID="ListBox1" runat="server" Height="78px" Width="127px">
</asp:ListBox>
<br /><br />
<asp:Label ID="lblMessage" runat="server" Font-Bold="true"></asp:Label>



Copy and Paste the following code in the code behind page
protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
{
    // Everytime the selection changes, clear the items in the listbox
    ListBox1.Items.Clear();
    // Loop thru each litemitem in the checkboxlist
    foreach (ListItem li in CheckBoxList1.Items)
    {
        // If the listitem is selected
        if (li.Selected)
        {
            // Add the listitem text to the listbox
            ListBox1.Items.Add(li.Text);

            // Add the lisitem as an object. This ensures the listitem is 
            // selected in the listbox. For this to work, listbox, 
            // SelectionMode must be set to Multiple. The SelectionMode
            // Property can be set in the HTML source also.
            // ListBox1.SelectionMode = ListSelectionMode.Multiple
            // ListBox1.Items.Add(li);
        }
    }
    // If nothing is selected from the checkboxlist
    if (CheckBoxList1.SelectedIndex == -1)
    {
        // Set the label ForeColor to Red
        lblMessage.ForeColor = System.Drawing.Color.Red;
    }
    // If atleast one listitem is selected
    else
    {
        // Set the label forecolor to black
        lblMessage.ForeColor = System.Drawing.Color.Black;
    }
    // Display the total number of items selected from the checkboxlist
    lblMessage.Text = ListBox1.Items.Count.ToString() + " item(s) selected";
}

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