If one of your validation is very complicated and does not fit in any of the validators, so what will you do? Dot Net Interview Questions

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Best is to go for CustomValidators..Below is a sample code for a custom validator which checks that a textbox should not have zero value

<asp:CustomValidator id="CustomValidator1" runat="server"
ErrorMessage="Number not divisible by Zero"
ControlToValidate="txtNumber"
OnServerValidate="ServerValidate"
ClientValidationFunction="CheckZero" /><br>
Input:
<asp:TextBox id="txtNumber" runat="server" />
<script language="javascript">
<!--
function CheckZero(source, args) {
int val = parseInt(args.Value, 10);
if (value==0) {
args.IsValid = false;
}
else {
args.IsValid = true;
}
}
// -->
</script>