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customvalidator

代码：

<script  runat="server">


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>    


 


<!DOCTYPE html>


<html>


<body>


 


<form runat="server">


<asp:Label runat="server" Text="Enter a username: " />


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


<asp:Button Text="Submit" runat="server"/>


<br>


<asp:Label id="mess" runat="server"/>


<br>


<asp:CustomValidator


ControlToValidate="txt1"


OnServerValidate="user"


Text="A username must be between 8 and 16 characters!"


runat="server"/>


</form>


 


</body>


</html>

结果：

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