Checkbox Validation in ASP.NET

Validation of check box is little bit tricky  but you can validate with Java Script

Add this script in the page.

<script type="text/javascript">
    function validateCheckBox(source,args)
    {
        var cb=document.getElementById("Privacy1");
        if(!cb.checked)
         args.IsValid=false;
    }
    </script>

add a Checkbox Control

<asp:CheckBox ID="Privacy1" runat="server"></asp:CheckBox>

Now you need to add a custom Validator:-

  <asp:CustomValidator ID="CustomValidator1" runat="server" 
            ErrorMessage="CustomValidator" 
            ValidateEmptyText="True" ClientValidationFunction="validateCheckBox"></asp:CustomValidator>