ASP.NET Tutorial/Validation/Error Highlight
Highlighting Validation Errors
<source lang="csharp">
<%@ 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>Validation Image</title>
</head> <body>
<form id="form1" runat="server">
<asp:Label id="lblFirstName" Text="First Name" AssociatedControlID="txtFirstName" Runat="server" />
<asp:TextBox id="txtFirstName" Runat="server" /> <asp:RequiredFieldValidator id="reqFirstName" ControlToValidate="txtFirstName" Text="<img src="Error.gif" alt="First name is required." />" Runat="server" />
<asp:Button id="btnSubmit" Text="Submit" Runat="server" />
</form>
</body> </html></source>