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<%@ Page Language="C#" %> "server"> void Page_PreRender() { foreach (BaseValidator valControl in Page.Validators) { WebControl assControl = (WebControl)Page.FindControl(valControl.ControlToValidate); if (!valControl.IsValid) assControl.BackColor = System.Drawing.Color.Yellow; else assControl.BackColor = System.Drawing.Color.White; } } <html xmlns="http://www.w3.org/1999/xhtml" > "Head1" runat="server"> Show Validators <body> <form id="form1" runat="server"> id="lblFirstName" Text="First Name" AssociatedControlID="txtFirstName" Runat="server" /> id="txtFirstName" Runat="server" /> id="reqFirstName" ControlToValidate="txtFirstName" Text="(Required)" EnableClientScript="false" Runat="server" /> id="lblLastName" Text="Last Name" AssociatedControlID="txtLastName" Runat="server" /> id="txtLastname" Runat="server" /> id="reqLastName" ControlToValidate="txtLastName" Text="(Required)" EnableClientScript="false" Runat="server" /> id="btnSubmit" Text="Submit" Runat="server" /> form> body> html>
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