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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.

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  1. <asp:CustomValidator runat="server" ID="rfvMember" OnServerValidate="cbMember_Validate" ValidateEmptyText="true" ErrorMessage="Member coverage is required." Display="None"></asp:CustomValidator>
  2.  
  3.  
  4. protected void cbMember_Validate(object sender, ServerValidateEventArgs e)
  5. 	{
  6. 		e.IsValid = cbMember.Checked;
  7. 	}

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