Required Field Markers
Required Field Markers are a common part of Web user interfaces to point out
where a field requires an entry before validation has to complain that
something is missing. The marker, usually a text or graphic element, resides
nearby the data entry field and is always shown.
DES includes two controls to setup Required Field Markers, the marker itself
and a description that appears on top of the page. In addition, each validator
has a property to turn on the marker.
Demo
The first element shown is the RequiredFieldsDescription control. The validator
to the right of the textbox has its ShowRequiredFieldMarker property set,
revealing the RequiredFieldMarker control, even when the validator itself is
not showing any error message.
Fields marked  require an entry.
ASP.NET Syntax for this demo
<des:RequiredFieldsDescription id=RequiredFieldsDescription1 runat=
"server"/>
<br>
<asp:TextBox id=TextBox1 runat="server"></asp:TextBox>
<des:RequiredTextValidator id=RequiredTextValidator1 runat="server"
ControlIDToEvaluate="TextBox1" ErrorMessage="This field is
required" ShowRequiredFieldMarker= "True">
<ErrorFormatterContainer>
<des:TextErrorFormatter
Display="Dynamic"></des:TextErrorFormatter>
</ErrorFormatterContainer>
</des:RequiredTextValidator>
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