Mega Code Archive
Using the CustomValidator control to perform server-side validations (VB)
<![CDATA[
<%@ Page Language="VB" %>
<script runat="server">
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
If Page.IsValid Then
Label1.Text = "VALID ENTRY!"
End If
End Sub
Sub ValidateNumber(sender As Object, args As ServerValidateEventArgs)
Try
Dim num As Integer = Integer.Parse(args.Value)
args.IsValid = ((num mod 5) = 0)
Catch ex As Exception
args.IsValid = False
End Try
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>CustomValidator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Number:
<asp:TextBox ID="TextBox1"
Runat="server"></asp:TextBox>
<asp:CustomValidator ID="CustomValidator1"
Runat="server" ControlToValidate="TextBox1"
ErrorMessage="Number must be divisible by 5"
OnServerValidate="ValidateNumber"></asp:CustomValidator>
<asp:Button ID="Button1" OnClick="Button1_Click"
Runat="server" Text="Button"></asp:Button>
<asp:Label ID="Label1" Runat="server"></asp:Label>
</div>
</form>
</body>
</html>
]]>