This works:
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<% /*
<asp:TextBox ID="txtTest" runat="server" />
<asp:RequiredFieldValidator
id="RequiredFieldValidator2"
runat="server"
EnableClientScript="true"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="txtTest"
Text="*" />
*/ %>
<CE:Editor id="Editor1"
runat="server"></CE:Editor>
<asp:RequiredFieldValidator
id="RequiredFieldValidator1"
runat="server"
EnableClientScript="true"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="Editor1"
Text="<h3>The body field is required!</h3>" />
<asp:Button ID="btnTest"
runat="server"
OnClick="btnTest_Click"
Text="Test" />
</div>
</form>
</body>
</html>
But the page does postback.
This validates the <asp:TextBox only:
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtTest" runat="server" />
<asp:RequiredFieldValidator
id="RequiredFieldValidator2"
runat="server"
EnableClientScript="true"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="txtTest"
Text="*" />
<CE:Editor id="Editor1"
runat="server"></CE:Editor>
<asp:RequiredFieldValidator
id="RequiredFieldValidator1"
runat="server"
EnableClientScript="true"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="Editor1"
Text="<h3>The body field is required!</h3>" />
<asp:Button ID="btnTest"
runat="server"
OnClick="btnTest_Click"
Text="Test" />
</div>
</form>
</body>
</html>
The Editor is not validated. What is the solution to this, thank you.