Page 82 - DCAP312_WEB_TECHNOLOGIES_II
P. 82
Web Technologies-II
Notes
Performing a custom client-side validation using the Custom Validator server
control
Visual C# .NET
<%@ Page Language= “C#” %>
<script runat= “server”>
void Button1_Click(Object sender, EventArgs e) {
if (Page.IsValid) {
Label1.Text = “VALID ENTRY!”;
}
}
void ValidateNumber(object source, ServerValidateEventArgs
args)
{
try
{
int num = int.Parse(args.Value);
args.IsValid = ((num%5) == 0);
}
catch(Exception ex)
{
args.IsValid = false;
}
}
</script>
<html>
<head>
</head>
<body>
<form runat= “server”>
<p>
Number:
<asp:TextBox id= “TextBox1”
runat= “server “></asp:TextBox>
<asp:CustomValidator id= “CustomValidator1”
runat= “server” ControlToValidate= “TextBox1”
ErrorMessage= “Number must be even”
OnServerValidate= “ValidateNumber”></asp:CustomValidator>
</p>
<p>
<asp:Button id= “Button1” onclick= “Button1_Click”
runat= “server” Text= “Button”></asp:Button>
</p>
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