CustomValidator Control

• None (the control is not displayed. Used to show the error message only in the ValidationSummary control)
• Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation
• Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation

Dynamic is default

<%@ Page 
Inherits="System.Web.UI.MobileControls.MobilePage"%>
<%@ Register TagPrefix="Mobile"
Namespace="System.Web.UI.MobileControls"
Assembly="System.Web.Mobile" %>

<script runat="server">
Sub Page2(Sender as Object,E as EventArgs)
If Page.IsValid Then
  ActiveForm=f2
  txt2.Text="Your username is: " & txt1.text
end if
End Sub

Sub user(source As object,args As ServerValidateEventArgs)
  if len(args.Value)<8 or len(args.Value)>16 then
   args.IsValid=false
  else
   args.IsValid=true
  end if
End Sub
</script>

<Mobile:Form id="f1" runat="server">

  <Mobile:Label runat="server">
  Please enter a username
  </Mobile:Label>

  <Mobile:TextBox id="txt1" runat="server" />

  <Mobile:CustomValidator runat="server"
  ControlToValidate="txt1"
  OnServerValidate="user"
  Text="A username must be between 8 and 16 characters!" />

  <Mobile:Command OnClick="Page2" runat="server">
  Submit</Mobile:Command>

</Mobile:Form>

<Mobile:Form id="f2" runat="server">
  <Mobile:Label id="txt2" runat="server" />
</Mobile:Form>