You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You add a TextBox control named TextBox1. You write the following code segment for validation. Protected Sub _ English Chinese Japan Korean - 24 - Test Information Co., Ltd. All rights reserved. CustomValidator1_ServerValidate(ByVal source As Object, _ ByVal args As ServerValidateEventArgs) Dim dt As DateTime = _ IIf([String].IsNullOrEmpty(args.Value), _ DateTime.Now, Convert.ToDateTime(args.Value)) args.IsValid = (DateTime.Now - dt).Days < 10 End Sub You need to validate the value of TextBox1. Which code fragment should you add to the Web page? （）
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