[ConfigurationPropertyAttribute("defaultType", DefaultValue = null, IsRequired = true)]
public string TypeName { get; set; }

<ConfigurationPropertyAttribute("defaultType", DefaultValue := Nothing, IsRequired := True)> _
Public Property TypeName As String

[ConfigurationPropertyAttribute(L"defaultType", DefaultValue = nullptr, IsRequired = true)]
public:
property String^ TypeName {
	String^ get ();
	void set (String^ value);
}