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单项选择题 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 void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args) {   DateTime dt = String.IsNullOrEmpty(args.Value) ? DateTime.Now : Convert.ToDateTime(args.Value);   args.IsValid = (DateTime.Now - dt).Days < 10;   }   You need to validate the value of TextBox1.  Which code fragment should you add to the Web page? ()

A、A

B、B

C、C

D、D

  • A
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