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Listing 3.2 - ValidationImage.aspx

Illustrates how you can display an image when there is a validation error.

Listing 3.2 - ValidationImage.aspx (C#)
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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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Validation Image</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <asp:Label
        id="lblFirstName"
        Text="First Name"
        AssociatedControlID="txtFirstName"
        Runat="server" />
    <br />    
    <asp:TextBox
        id="txtFirstName"
        Runat="server" />
    <asp:RequiredFieldValidator
        id="reqFirstName"
        ControlToValidate="txtFirstName"
        Text="<img src='Error.gif' alt='First name is required.' />" 
        Runat="server" />   
     
     <br /><br />
     
     <asp:Button
        id="btnSubmit"
        Text="Submit"
        Runat="server" />   
    
    </div>
    </form>
</body>
</html>