Are you required applicant?
<asp:CheckBox ID="CheckBox1" runat="server" Text="Yes" />
<asp:CheckBox ID="CheckBox2" runat="server" Text="No" />
Actually this is code, i do not know why they use two Checkbox instead of Checkboxlist, but they told me do not change it. and make the two checkbox required(using RequiredFieldValidator). I know how to use RequiredFieldValidator, but how can i make RequiredFieldValidator control two Checkbox, only pass if one of them selected