You use Microsoft .NET Framework 4 to create a Windows Presentation Framework (WPF) application. You plan to create a custom control that contains four text input fields. Each of the text input fields within the control will contain a label. You need to ensure that the text input fields within the control can be validated by using a regular expression validator. Which class should you inherit from?（）
1、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.The application displays a list of books.You wri...
2、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You add a property named ServiceContext to a co...
3、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.The application has multiple data entry windows....
4、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Forms application.You plan to use a Windows Presentation Foundation (WPF) control of the...
5、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a custom Windows Presentation Foundation (WPF) application.Your environment includes several WPF appl...
6、You use Microsoft .NET Framework 4 to
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You write the following code fragment. (Line num...