You must set five properties when using this control:
ControlToValidate: The ID of the form field being validated.
Text: The error message.
MinimumValue: The minimum value.
MaximumValue: The maximum value.
Type: The type of comparison.
Possible values are String, Integer, Double, Date, and Currency.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show RangeValidator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblAge"
Text="Age:"
AssociatedControlID="txtAge"
Runat="server" />
<asp:TextBox
id="txtAge"
Runat="server" />
<asp:RangeValidator
id="reqAge"
ControlToValidate="txtAge"
Text="(Invalid Age)"
MinimumValue="5"
MaximumValue="100"
Type="Integer"
Runat="server" />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</div>
</form>
</body>
</html>