Tuesday, September 22, 2015

ASP.NET CheckBoxList and ListBox real time example

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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" 
    <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>
<br />
<asp:ListBox ID="ListBox1" runat="server" Height="78px" Width="127px">
<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
    // 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

            // 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
        // 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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