ASP.Net/Validation by Control/Validation Alert
Change invalid control"s background color (C#)
<source lang="csharp">
<%@ Page Language="C#" %> <script runat="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;
}
}
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server">
<title>Show Validators</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="(Required)"
EnableClientScript="false"
Runat="server" />
<asp:Label
id="lblLastName"
Text="Last Name"
AssociatedControlID="txtLastName"
Runat="server" />
<asp:TextBox
id="txtLastname"
Runat="server" />
<asp:RequiredFieldValidator
id="reqLastName"
ControlToValidate="txtLastName"
Text="(Required)"
EnableClientScript="false"
Runat="server" />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
</form>
</body> </html>
</source>
