Loop through CheckBoxes in ASP.Net

Put the CheckBoxes inside Panel control and use the following code

HTML

<asp:Panel ID="Panel1" runat="server">
    <asp:CheckBox ID="CheckBox1" Text="Apple" runat="server" />
    <asp:CheckBox ID="CheckBox2" Text="Mango" runat="server" />
    <asp:CheckBox ID="CheckBox3" Text="Orange" runat="server" />
    <asp:CheckBox ID="CheckBox4" Text="Banana" runat="server" />
    <asp:CheckBox ID="CheckBox5" Text="Grapes" runat="server" />
</asp:Panel>
<asp:Button ID="Button1" Text="Submit" runat="server" OnClick="Submit" />
<br />
<asp:Label ID="lblChecked" runat="server" />

Code

protected void Submit(object sender, EventArgs e)
{
    foreach (CheckBox checkbox in Panel1.Controls.OfType<CheckBox>())
    {
        if (checkbox.Checked)
        {
            lblChecked.Text += checkbox.Text + "<br />";
        }
    }
}