Require a checkbox to be checked:

/ Published in: C#
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NOTE:** Can't put controltovalidate property on customvalidator for this or it'll break since checkboxes are one of the few controls that .net can't validate.

Copy this code and paste it in your HTML
  1. <asp:CustomValidator runat="server" ID="rfvMember" OnServerValidate="cbMember_Validate" ValidateEmptyText="true" ErrorMessage="Member coverage is required." Display="None"></asp:CustomValidator>
  4. protected void cbMember_Validate(object sender, ServerValidateEventArgs e)
  5. {
  6. e.IsValid = cbMember.Checked;
  7. }

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