Performing validation against no particular field. : CustomValidator « Validation « ASP.NET Tutorial
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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load()
{
if (!Page.IsPostBack)
ResetStartTime();
}
void btnAgain_Click(Object sender, EventArgs e)
{
ResetStartTime();
}
void ResetStartTime()
{
Session["StartTime"] = DateTime.Now;
}
void valAnswer_ServerValidate(Object source, ServerValidateEventArgs args)
{
DateTime startTime = (DateTime)Session["StartTime"];
if (startTime.AddSeconds(5) > DateTime.Now)
args.IsValid = true;
else
args.IsValid = false;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Timed Test</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblQuestion"
Text="What was Aristotle's first name?"
AssociatedControlID="txtAnswer"
Runat="server" />
<br />
<asp:TextBox
id="txtAnswer"
Runat="server" />
<asp:CustomValidator
id="valAnswer"
Text="(You answered too slowly!)"
OnServerValidate="valAnswer_ServerValidate"
Runat="server" />
<br /><br />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
<asp:Button
id="btnAgain"
Text="Try Again!"
CausesValidation="false"
OnClick="btnAgain_Click"
Runat="server" />
</div>
</form>
</body>
</html>