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Asp.net check box list is used to display more than one check box's .Using this we can display check box directly or from database .
Syntax :
   <asp:CheckBoxList ID="CheckBoxList ID" runat="server">
<asp:ListItem Value="value"> Check box text </asp:ListItem>
        </asp:CheckBoxList>

 asp:ListItem is used to specify the check box list items, using this we can create multiple items.

Example: 
 Display favorite Language :
Design:










Code:
 <form id="form1" runat="server">
    <div>
    Select Your Favorite Language
   
       
    <asp:CheckBoxList ID="CheckBoxList1" runat="server" >
<asp:ListItem Value="value1">C#</asp:ListItem>
<asp:ListItem Value="value2">Visual Basic</asp:ListItem>
<asp:ListItem Value="value3">CSS</asp:ListItem>
</asp:CheckBoxList>

        <asp:Label ID="Label1" runat="server"></asp:Label>
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" Text="Get Value"
            onclick="Button1_Click" />
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Get Text"
            Width="69px" />
    </div>
    </form>

.CS Page
//Button 1 retrieve Text value of current selection
    protected void Button1_Click(object sender, EventArgs e)
        {
            foreach (ListItem item in CheckBoxList1.Items)
{
if (item.Selected == true)
{
Label1.Text += "you selected " + item.Text + "<br />";
}
}
  }

//Button 2 retrieve ID value of current selection
        protected void Button2_Click(object sender, EventArgs e)
        {
            foreach (ListItem item in CheckBoxList1.Items)
            {
                if (item.Selected == true)
                {
                    Label1.Text += "you selected " + item.Value + "<br />";
                }
            }
        }
Result: