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<%@ Page Language="C#"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server" language="C#">
protected void ServerAddMoreValidation(object o, ServerValidateEventArgs e) {
try {
int theInput = Int32.Parse(e.Value);
if (theInput < 0) {
theValidator.ErrorMessage = "please enter a positive value";
}
else {
theValidator.ErrorMessage = "please enter at least " + (theInput + 1).ToString();
}
}
catch {
}
e.IsValid = false;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Target Page</title>
</head>
<body>
<form runat="server">
Enter the quantity:
<asp:textbox runat="server" id="quantity" />
<asp:CustomValidator
runat="server"
id="theValidator"
ControlToValidate="quantity"
OnServerValidate="ServerAddMoreValidation"
ErrorMessage="Try Again"/><br />
<asp:label runat="server" id="theFeedback"/><br />
<asp:button type="submit" runat="server" Text="Submit" />
</form>
</body>
</html>
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